docs+src: complete Steps 1-3 outcomes + auth re-sync baseline

This commit captures everything produced during autodev existing-code
Steps 1 (Document), 2 (Architecture Baseline Scan), and 3 (Test Spec),
together with the targeted auth + CORS re-sync triggered on 2026-05-14
when codebase drift was detected at Step 4 entry. None of this work was
previously committed.

Step 1 (Document) — 50+ _docs/02_document/ files: problem, solution,
architecture, system flows, glossary, module-layout, per-component
specs (01..06), modules, deployment, diagrams, data model, FINAL
report, verification log, discovery.

Step 2 (Architecture Baseline) — architecture_compliance_baseline.md.
Verdict PASS_WITH_WARNINGS (0 Critical, 0 High, 1 Medium, 2 Low). No
High/Critical findings; auto-chained to Step 3 per existing-code flow.

Step 3 (Test Spec) — _docs/02_document/tests/* (67 scenarios across
blackbox, security, resilience, resource-limit, performance), plus
e2e/docker-compose.test.yml, e2e/seed/run.sh, scripts/run-tests.sh,
scripts/run-performance-tests.sh. Coverage 88% over the active scope
(40 of 45 items covered, 6 RB-deferred, 5 documented-as-uncovered).

Targeted auth + CORS re-sync — replaces the deleted in-house token
issuer with a JWKS-verifier model. AuthController and TokenService
removed; JwtExtensions switched from HS256 symmetric to ES256 over
admin's JWKS. ConfigurationResolver and CorsConfigurationValidator
added under src/Infrastructure/. ADR-002 and ADR-006 retired; SEC-01,
SEC-02, SEC-03 marked Closed. One new testability risk recorded in
architecture.md Open Risks Section 6 (JWKS HTTPS gating).

Source changes:
- src/Auth/JwtExtensions.cs (modified) — ES256, JWKS, alg pinning
- src/Program.cs (modified) — DI wiring for ConfigurationResolver
  and CorsConfigurationValidator
- src/Controllers/AuthController.cs (deleted) — no in-service issuance
- src/Services/TokenService.cs (deleted) — same
- src/Infrastructure/ConfigurationResolver.cs (new)
- src/Infrastructure/CorsConfigurationValidator.cs (new)
- .env.example (new) — required env var documentation
- .gitignore (updated)

Cross-repo coordination: _docs/cross-repo/flights_h1_h2_h3_change_spec
captures the change-spec for downstream services that consumed the now
deleted /auth endpoints.

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

_docs/02_document/modules/database-layer.md

@@ -0,0 +1,30 @@
+# Module: Database layer (`src/Database`)
+
+## Purpose
+
+PostgreSQL schema and Linq2DB mapping for annotations, media, detections, queue buffer, settings, and `detection_classes`. Underpins every HTTP module in `01_annotations.md`.
+
+## Public interface
+
+- `AppDataConnection` — `ITable<>` for all mapped entities.
+- `DatabaseMigrator.Migrate` — embedded SQL: `CREATE TABLE IF NOT EXISTS` / `ALTER … IF NOT EXISTS`, seed detection classes.
+
+## Entities (summary)
+
+- `Annotation`, `Media`, `Detection` — core annotation + YOLO row model (`time` stored as BIGINT ticks).
+- `AnnotationsQueueRecord` — failsafe outbox (`operation`, `annotation_ids`).
+- `SystemSettings` — includes `GenerateAnnotatedImage`, `SilentDetection` (suite §Annotated Image / Silent Detection).
+- `DirectorySettings` — `/data/...` roots consumed by `PathResolver`.
+- `DetectionClass`, `UserSettings`, `CameraSettings`.
+
+## Dependencies
+
+Wire enums on columns.
+
+## Consumers
+
+All services and `ClassesController`.
+
+## Suite doc
+
+Annotation identity and ER-level behavior; cross-check `00_database_schema.md` in suite when entities evolve.