chore: remove the bug-report integration

Drop the in-app bug-report surface end to end: the user submission page,
the feedback intake and admin inbox, the optional GitHub-issue
escalation, the operator config, and the dedicated achievement badges.

- delete the /bugreport page and the bugreport / feedback / admin-feedback API routes
- drop the Feedback model, its enums, and the AppSettings GitHub-issue and enable columns (migration 0205)
- remove the admin Feedback section, the Bug Report integration card, and the system-status row
- drop the bug-report nav entry and the app-settings provider that only carried its flag
- remove the bug-hunter achievement badges and their metric
- prune the related i18n keys across every locale and the encrypted-column and key-rotation registries

docs/api/README.md

@@ -41,8 +41,8 @@ intentional:
 - **`tags`** — domain groupings (`Auth`, `Measurements`, `Medications`,
   `Mood`, `Dashboard`, `Insights`, `Achievements`, `DoctorReport`,
   `Integrations`, `User`, `Tokens`, `Notifications`, `Onboarding`,
-  `Health`, `Settings`, `Analytics`, `Export`, `AuditLog`, `Feedback`,
-  `BugReport`, `Monitoring`, `Webhooks`, `Ingest`, `Admin`).
+  `Health`, `Settings`, `Analytics`, `Export`, `AuditLog`,
+  `Monitoring`, `Webhooks`, `Ingest`, `Admin`).
 - **`securitySchemes`**:
   - `bearerAuth` — long-lived `hlk_*` API tokens issued via `POST /api/tokens`.
     Required on `/api/ingest/medication`.