Fix DC-005 depth-2 route path bugs: 67 broken requires across 21 files

The DC-005 src/ refactor left depth-2 route files (routes/auth/*,
routes/recipes/*, routes/apps/*, routes/arr/*, routes/config/*) with
broken require() paths. A filesystem-resolving scanner found 67 broken
requires across 21 files — three distinct bug classes:

  A) '../../../src/...' (3 levels up, above package root) — Bug 7, ~49 occurrences
  B) '../src/utils/...' (1 level up, resolves to nonexistent routes/src/) — ~15 occurrences
  C) routes/apps/restore.js:5 used utilities/responses (wrong dir) — should be utils/responses

All fixed to '../../src/...' (or '../../src/utils/responses' for class C).
routes/auth/totp.js was already fixed in the DC-006 commit.

Post-fix: 922/922 tests pass, zero new ESLint warnings. No logic changes —
purely mechanical require() path corrections.

BACKLOG.md

@@ -48,7 +48,7 @@
 - **owner:** krystie
 - **details:** 40+ JS files at `dashcaddy-api/` root level (auth-manager.js, credential-manager.js, etc.). Move into organized subdirs under `src/` (e.g., `src/managers/`, `src/security/`, `src/docker/`). Update all require() paths. This is a big refactor — run tests after.
 - **result:** Refactor complete on `krystie-improvements` branch (879/879 tests passing on branch). Merged into main via commit `283121e` after resolving 24 conflicts. Post-merge regression check surfaced one additional latent path bug from DC-005: `src/monitoring/health-checker.js` still had `require('./platform-paths')` (relative to `src/monitoring/`), but `platform-paths.js` lives at top level — fixed in commit `9688e64` to `require('../../platform-paths')`. Without that fix, 59 cascading test failures in `health-checker.test.js`. Final post-merge state: 921/922 tests passing.
-- **remaining latent bugs (tracked, NOT yet fixed):** The DC-005 path-rewrite script left depth-2 route files (`routes/auth/*.js`, `routes/recipes/*.js`, `routes/apps/*.js`, `routes/arr/*.js`, `routes/config/*.js`) with `'../../../src/...'` — **3 levels up instead of 2**, which goes above `dashcaddy-api/` entirely. Required path should be `'../../src/...'` for depth-2 routes. Tests didn't catch this because no test previously imported any depth-2 route (only depth-1 routes like `routes/services.js` were tested). Confirmed-broken imports (with file → offending line): `routes/auth/totp.js:2` (FIXED in DC-006 commit), `routes/auth/keys.js:2`, `routes/auth/sso-gate.js:2-3`, `routes/auth/session-handlers.js:2-3`, `routes/recipes/manage.js:2-3`, `routes/recipes/deploy.js:2-3`, `routes/recipes/index.js:2-3`, `routes/config/assets.js:2-4`, `routes/config/settings.js:2-4`, `routes/config/backup.js:2-4`, `routes/apps/restore.js:2`, `routes/apps/compose.js:2-3`, `routes/apps/deploy.js:2-5`, `routes/apps/helpers.js:2-3`, `routes/apps/templates.js:2-3`, `routes/apps/removal.js:2-3`, `routes/arr/detect.js:2`, `routes/arr/smart-connect.js:2`, `routes/arr/credentials.js:2-3`, `routes/arr/helpers.js:2`, `routes/arr/config.js:2-5`, `routes/arr/plex.js:2`. The fix is mechanical (3 → 2 levels) but touches ~22 files — should be its own PR/commit for clean review.
+- **remaining latent bugs (FIXED):** The DC-005 path-rewrite script left depth-2 route files (`routes/auth/*.js`, `routes/recipes/*.js`, `routes/apps/*.js`, `routes/arr/*.js`, `routes/config/*.js`) with broken require() paths. A filesystem-resolving scanner found **67 broken requires across 21 files** — three distinct bug classes: (A) `'../../../src/...'` (3 levels up, goes above package root) — the documented Bug 7, ~49 occurrences; (B) `'../src/utils/...'` (only 1 level up, resolves to nonexistent `routes/src/`) — undocumented, ~15 occurrences for `responses` and `logging`; (C) `routes/apps/restore.js:5` imported `utilities/responses` when the module lives at `utils/responses` (wrong directory + wrong depth). All 67 fixed to `'../../src/...'` (or `'../../src/utils/responses'` for the class-C case). `routes/auth/totp.js` was already fixed in the DC-006 commit. Tests didn't catch any of these previously because no test imported any depth-2 route. Post-fix: 922/922 tests pass, zero new ESLint warnings.
 
 ### DC-006: Add integration test for TOTP auth flow
 - **status:** done