[glm-grade=B] fix(notifications): repair UI/API contract drift — SMTP auth, event gate, test button (DC-092)

Three user-facing notification features were silently dead from contract
drift between the settings UI and the backend:

1. SMTP auth never applied: the UI sent email.user/email.pass while the
   manager read username/password. Route now normalizes aliases; legacy
   config files canonicalize at load.
2. Event toggles were cosmetic: UI sent camelCase keys (containerDown),
   the send() gate read kebab-case ('container-down'). EVENT_ALIASES now
   folds every known spelling (manager gate, route store, legacy files);
   UI sends and reads canonical keys.
3. Deploy/auto-restart notifications always dropped: deploy-success/
   deploy-failed/auto-restart were missing from DEFAULT events, and
   send('test') was itself gated -> the Test button was a no-op. Defaults
   added; 'test' bypasses the gate.

Also: strict boolean contract (string 'false' for secure/enabled rejected
— previously coerced truthy, silently forcing TLS), SMTP port bounds,
non-destructive credential merge (blank password no longer clobbers the
stored one), GET /config returns port/secure/to/username + hasPassword
(password never returned), full form prefill + keep-hint placeholder.

Verified live pre-fix: send('test')/'deploymentSuccess'/'auto-restart'
all returned 'not enabled'. Post-fix: +20 tests (route + manager),
full suite 2641/2641 (112 suites).

Judge: GLM-5.3 cold read via delegate_task (deleg_ad765d63), grade B,
ship, zero blockers; judge independently ran the DC-092 suites (38/38).
Polish #1 (canonical event for provider titles) folded in. Remaining
emitters with the same gate-miss class (recipeRemoved, workflow,
ssl-cert-expiry, dns-propagation, drift-detected, dependency-restart-*)
noted for a follow-up tick.

dashcaddy-api/src/managers/notification-manager.js

@@ -7,6 +7,28 @@ const fs = require('fs');
 const path = require('path');
 const nodemailer = require('nodemailer');
 
+// Canonical event names are kebab-case ('container-down'). Emitters and the
+// settings UI historically send camelCase ('containerDown', 'deploymentSuccess')
+// and the alias map below folds every known spelling onto the canonical key.
+// DC-092: before this map, the events gate looked up the RAW event name, so
+// 'deploymentSuccess' (routes/apps/deploy.js, routes/recipes/deploy.js) and
+// 'auto-restart' (resource-monitor.js) were absent from DEFAULT events and
+// silently dropped, and UI camelCase toggles never reached the kebab keys the
+// gate reads — the toggles were cosmetic.
+const EVENT_ALIASES = {
+  containerDown: 'container-down',
+  containerUp: 'container-up',
+  deploymentSuccess: 'deploy-success',
+  deploymentFailed: 'deploy-failed',
+  deploySuccess: 'deploy-success',
+  deployFailed: 'deploy-failed',
+  resourceAlert: 'alert',
+  updateAvailable: 'update-available',
+  backupComplete: 'backup-complete',
+  backupFailed: 'backup-failed',
+  autoRestart: 'auto-restart',
+};
+
 const DEFAULT_CONFIG = {
   enabled: true,
   providers: {
@@ -21,7 +43,13 @@ const DEFAULT_CONFIG = {
     'alert': true,
     'backup-complete': true,
     'backup-failed': true,
-    'update-available': true
+    'update-available': true,
+    // DC-092: emitters (apps/recipes deploy routes) fire these; they were
+    // missing from defaults entirely, so every deploy notification was
+    // silently dropped before this fix.
+    'deploy-success': true,
+    'deploy-failed': true,
+    'auto-restart': true
   }
 };
 
@@ -48,6 +76,7 @@ class NotificationManager extends EventEmitter {
     try {
       if (fs.existsSync(this.NOTIFICATIONS_FILE)) {
         const data = JSON.parse(fs.readFileSync(this.NOTIFICATIONS_FILE, 'utf8'));
+        this._canonicalizeLegacyKeys(data);
         this.config = this._mergeConfig(DEFAULT_CONFIG, data);
       }
     } catch (error) {
@@ -55,6 +84,40 @@ class NotificationManager extends EventEmitter {
     }
   }
 
+  /**
+   * DC-092: configs saved by older clients may contain the legacy spellings
+   * the old POST /config merged verbatim — email.user/email.pass instead of
+   * username/password, and camelCase event keys instead of kebab-case. Fold
+   * them onto the canonical keys BEFORE the defaults merge (after the merge
+   * the canonical keys always exist from defaults, so the alias guards would
+   * never fire) so a config file written before this fix keeps working: SMTP
+   * auth applies and event toggles gate correctly.
+   */
+  _canonicalizeLegacyKeys(data) {
+    // Email credentials: user/pass → username/password (only when the
+    // canonical key is absent in the raw data; canonical wins on conflict).
+    const email = data?.providers?.email;
+    if (email && typeof email === 'object') {
+      if (email.user !== undefined && email.username === undefined) email.username = email.user;
+      if (email.pass !== undefined && email.password === undefined) email.password = email.pass;
+      delete email.user;
+      delete email.pass;
+      // secure must be a real boolean: legacy string values (e.g. "false"
+      // from hand-edited JSON) are truthy under !! and would force TLS.
+      if (email.secure !== undefined) email.secure = email.secure === true;
+    }
+    // Event keys: camelCase → kebab-case canonical.
+    if (data?.events && typeof data.events === 'object') {
+      for (const [k, v] of Object.entries(data.events)) {
+        const canonicalKey = EVENT_ALIASES[k];
+        if (canonicalKey) {
+          if (data.events[canonicalKey] === undefined) data.events[canonicalKey] = v;
+          delete data.events[k];
+        }
+      }
+    }
+  }
+
   /**
    * Merge loaded config with defaults
    */
@@ -130,9 +193,15 @@ class NotificationManager extends EventEmitter {
       return { success: false, error: 'Notifications disabled' };
     }
 
-    // Check if event is enabled
-    if (event && this.config.events && !this.config.events[event]) {
-      return { success: false, error: `Event ${event} not enabled` };
+    // Fold legacy/camelCase spellings onto canonical kebab-case keys (DC-092).
+    const canonical = EVENT_ALIASES[event] || event;
+
+    // Check if event is enabled. 'test' bypasses the gate: it is the settings
+    // UI "Send Test" flow and is not an operator-togglable event (there is no
+    // 'test' key in events; gating on it made the Test button a no-op).
+    const gated = canonical !== 'test';
+    if (gated && this.config.events && this.config.events[canonical] !== true) {
+      return { success: false, error: `Event ${canonical} not enabled` };
     }
 
     const results = [];
@@ -141,7 +210,7 @@ class NotificationManager extends EventEmitter {
     // Discord
     if (providers.discord?.enabled && providers.discord?.webhookUrl) {
       try {
-        const result = await this.sendDiscord(this._formatText(data, event), this._formatEmbed(data, event, type));
+        const result = await this.sendDiscord(this._formatText(data, canonical), this._formatEmbed(data, canonical, type));
         results.push({ provider: 'discord', ...result });
       } catch (error) {
         results.push({ provider: 'discord', success: false, error: error.message });
@@ -151,7 +220,7 @@ class NotificationManager extends EventEmitter {
     // Telegram
     if (providers.telegram?.enabled && providers.telegram?.botToken && providers.telegram?.chatId) {
       try {
-        const result = await this.sendTelegram(this._formatText(data, event));
+        const result = await this.sendTelegram(this._formatText(data, canonical));
         results.push({ provider: 'telegram', ...result });
       } catch (error) {
         results.push({ provider: 'telegram', success: false, error: error.message });
@@ -161,7 +230,7 @@ class NotificationManager extends EventEmitter {
     // ntfy
     if (providers.ntfy?.enabled && providers.ntfy?.topic) {
       try {
-        const result = await this.sendNtfy(this._formatText(data, event), this._formatTitle(event));
+        const result = await this.sendNtfy(this._formatText(data, canonical), this._formatTitle(canonical));
         results.push({ provider: 'ntfy', ...result });
       } catch (error) {
         results.push({ provider: 'ntfy', success: false, error: error.message });
@@ -172,8 +241,8 @@ class NotificationManager extends EventEmitter {
     if (providers.email?.enabled && providers.email?.host && providers.email?.to) {
       try {
         const result = await this.sendEmail(
-          this._formatTitle(event),
-          this._formatText(data, event)
+          this._formatTitle(canonical),
+          this._formatText(data, canonical)
         );
         results.push({ provider: 'email', ...result });
       } catch (error) {
@@ -183,9 +252,9 @@ class NotificationManager extends EventEmitter {
 
     const allSucceeded = results.every(r => r.success);
     this._addToHistory({
-      title: this._formatTitle(event),
+      title: this._formatTitle(canonical),
       type,
-      event,
+      event: canonical,
       results
     });
 
@@ -290,7 +359,7 @@ class NotificationManager extends EventEmitter {
     const transporter = nodemailer.createTransport({
       host,
       port: parseInt(port) || 587,
-      secure: !!secure,
+      secure: secure === true,
       auth: username ? {
         user: username,
         pass: password