[AZ-484] Cycle 1 Steps 12-16: docs, security, perf, deploy report

Captures the post-implementation autodev gates for AZ-484 multi-source
tile storage:

- Step 12 (Test-Spec Sync): added 7 AC rows (AZ-484 AC-1..AC-7) and a
  PT-07 NFR row to traceability-matrix.md; added PT-07 scenario to
  performance-tests.md.
- Step 13 (Update Docs): refreshed data_model.md (tiles columns +
  indexes + selection rule + UPSERT contract + migrations 012/013),
  module-layout.md (Common/Enums section with L-001 guidance,
  DataAccess imports-from now lists 6 sites), 6 module / component
  docs to reflect the new repo signatures, source/captured_at fields,
  and Dapper enum bypass workaround. ripple_log_cycle1.md records
  zero out-of-scope ripple.
- Step 14 (Security Audit): PASS_WITH_WARNINGS - 0 Critical, 0 High,
  5 Medium, 5 Low. AZ-484 itself added zero new findings. Hardening
  items (Postgres default creds, .env in build context, GMaps key
  rotation, ASP.NET Core 8.0.21 -> 8.0.25, rate limiter) recorded
  for separate tickets.
- Step 15 (Performance Test): all PT-01..PT-07 scenarios Unverified
  (non-blocking); PT-07 baseline-comparison harness deferred to a
  leftover for next cycle.
- Step 16 (Deploy): cycle deploy report covering migration safety,
  rollback path, post-deploy verification, security caveats.

Co-authored-by: Cursor <cursoragent@cursor.com>

_docs/02_document/modules/dataaccess_migrator.md

@@ -23,7 +23,7 @@ Runs DbUp-based SQL migrations against PostgreSQL on application startup. Ensure
 ## Consumers
 - `Program.cs` — instantiated directly (not via DI) and called during startup. If migration fails, the application throws and does not start.
 
-## Migrations (11 scripts)
+## Migrations (13 scripts)
 1. `001_CreateTilesTable.sql`
 2. `002_CreateRegionsTable.sql`
 3. `003_CreateIndexes.sql`
@@ -35,6 +35,8 @@ Runs DbUp-based SQL migrations against PostgreSQL on application startup. Ensure
 9. `009_AddGeofencePolygonIndex.sql`
 10. `010_AddTilesZipToRoutes.sql`
 11. `011_AddTileCoordinates.sql`
+12. `012_DropTileVersionConstraint.sql` — drops the legacy 5-col `(latitude, longitude, tile_zoom, tile_size_meters, version)` unique index, replaces with 4-col `idx_tiles_unique_location` (preparation for AZ-484).
+13. `013_AddTileSourceAndCapturedAt.sql` — AZ-484 multi-source tile storage. Transactional. Adds `source` (VARCHAR(32) NOT NULL DEFAULT 'google_maps') and `captured_at` (TIMESTAMP NOT NULL) columns; backfills existing rows with `source='google_maps'`, `captured_at=created_at`; drops `idx_tiles_unique_location` and creates 5-col `idx_tiles_unique_location_source` on `(latitude, longitude, tile_zoom, tile_size_meters, source)`. Idempotent against partial replays.
 
 ## Configuration
 Receives connection string directly as constructor parameter.