refactor(context): Extract context modules from god object

- Create src/context/docker.js - Docker operations
- Create src/context/caddy.js - Caddyfile manipulation
- Create src/context/dns.js - DNS token management and API calls
- Create src/context/session.js - Session wrapper
- Create src/context/index.js - Context assembly (DI container)

Breaks up the 50+ property ctx god object into domain-specific modules

dashcaddy-api/src/context/index.js

@@ -0,0 +1,175 @@
+/**
+ * Context assembly - Dependency injection container
+ * Assembles all context objects needed by routes
+ */
+const { createDockerContext } = require('./docker');
+const { createCaddyContext } = require('./caddy');
+const { createDnsContext } = require('./dns');
+const { createSessionContext } = require('./session');
+
+/**
+ * Assemble the full application context
+ * This replaces the old "god object" ctx with explicit construction
+ */
+function assembleContext({
+  // Config
+  siteConfig,
+  buildDomain,
+  buildServiceUrl,
+  SERVICES_FILE,
+  CONFIG_FILE,
+  TOTP_CONFIG_FILE,
+  TAILSCALE_CONFIG_FILE,
+  NOTIFICATIONS_FILE,
+  ERROR_LOG_FILE,
+  DNS_CREDENTIALS_FILE,
+  CADDYFILE_PATH,
+  CADDY_ADMIN_URL,
+  
+  // State managers
+  servicesStateManager,
+  configStateManager,
+  
+  // Managers
+  credentialManager,
+  authManager,
+  licenseManager,
+  healthChecker,
+  updateManager,
+  backupManager,
+  resourceMonitor,
+  auditLogger,
+  portLockManager,
+  selfUpdater,
+  dockerMaintenance,
+  logDigest,
+  dockerSecurity,
+  
+  // Templates
+  APP_TEMPLATES,
+  TEMPLATE_CATEGORIES,
+  DIFFICULTY_LEVELS,
+  RECIPE_TEMPLATES,
+  RECIPE_CATEGORIES,
+  
+  // Helpers
+  asyncHandler,
+  errorResponse,
+  ok,
+  fetchT,
+  httpsAgent,
+  log,
+  logError,
+  safeErrorMessage,
+  getServiceById,
+  readConfig,
+  saveConfig,
+  addServiceToConfig,
+  validateURL,
+  strictLimiter,
+  totpConfig,
+  saveTotpConfig,
+  loadSiteConfig,
+  loadNotificationConfig,
+  resyncHealthChecker,
+  
+  // Middleware result
+  middlewareResult,
+  
+  // App
+  app,
+}) {
+  // Create domain-specific contexts
+  const docker = createDockerContext(dockerSecurity);
+  const caddy = createCaddyContext(CADDYFILE_PATH, CADDY_ADMIN_URL, fetchT, httpsAgent, log, siteConfig, buildDomain);
+  const dns = createDnsContext(siteConfig, buildDomain, credentialManager, fetchT, httpsAgent, log, DNS_CREDENTIALS_FILE);
+  const session = createSessionContext(middlewareResult);
+
+  // Notification context (inline for now - could be extracted)
+  const notification = {
+    // These will be populated by server.js for now
+    // TODO: Extract notification module
+  };
+
+  // Tailscale context (inline for now - could be extracted)
+  const tailscale = {
+    // These will be populated by server.js for now
+    // TODO: Extract tailscale module
+  };
+
+  // Assemble flat context (temporary - routes still expect this)
+  const ctx = {
+    // Namespaced contexts
+    docker,
+    caddy,
+    dns,
+    session,
+    notification,
+    tailscale,
+    
+    // App and config
+    app,
+    siteConfig,
+    
+    // State managers
+    servicesStateManager,
+    configStateManager,
+    
+    // Managers
+    credentialManager,
+    authManager,
+    licenseManager,
+    healthChecker,
+    updateManager,
+    backupManager,
+    resourceMonitor,
+    auditLogger,
+    portLockManager,
+    selfUpdater,
+    dockerMaintenance,
+    logDigest,
+    
+    // Templates
+    APP_TEMPLATES,
+    TEMPLATE_CATEGORIES,
+    DIFFICULTY_LEVELS,
+    RECIPE_TEMPLATES,
+    RECIPE_CATEGORIES,
+    
+    // Helpers
+    asyncHandler,
+    errorResponse,
+    ok,
+    fetchT,
+    log,
+    logError,
+    safeErrorMessage,
+    buildDomain,
+    buildServiceUrl,
+    getServiceById,
+    readConfig,
+    saveConfig,
+    addServiceToConfig,
+    validateURL,
+    strictLimiter,
+    
+    // Config helpers
+    totpConfig,
+    saveTotpConfig,
+    loadSiteConfig,
+    loadNotificationConfig,
+    resyncHealthChecker,
+    
+    // File paths
+    SERVICES_FILE,
+    CONFIG_FILE,
+    TOTP_CONFIG_FILE,
+    TAILSCALE_CONFIG_FILE,
+    NOTIFICATIONS_FILE,
+    ERROR_LOG_FILE,
+  };
+
+  return ctx;
+}
+
+module.exports = { assembleContext };