[AZ-808] [AZ-811] Strict validation on region POST + lat/lon GET

AZ-808: FluentValidation for POST /api/satellite/request
- RegionRequestValidator: id non-empty, lat/lon/sizeMeters/zoomLevel ranges
- RequestRegionRequest: [JsonRequired] on every property, no implicit defaults
- Wired via .WithValidation<RequestRegionRequest>() in MapPost chain
- Unit + integration tests + curl probe script
- New contract: contracts/api/region-request.md v1.0.0

AZ-811: FluentValidation + envelope filter for GET /api/satellite/tiles/latlon
- GetTileByLatLonQuery: nullable record (double?/int?) so the minimal-API
  binder never short-circuits with BadHttpRequestException before filters
- GetTileByLatLonQueryValidator: Cascade(Stop) + NotNull + InclusiveBetween
  per param; missing surfaces as `\`<name>\` is required.`
- RejectUnknownQueryParamsEndpointFilter: reusable IEndpointFilter that
  rejects any query key outside the allowed set with errors[<key>] map;
  catches legacy `?Latitude=` typos and hostile probes (`?debug=1&admin=1`)
- Handler: [AsParameters] GetTileByLatLonQuery + .Value deref post-validator
- Unit (validator + filter) + integration tests + curl probe script
- New contract: contracts/api/tile-latlon.md v1.0.0

Shared hygiene
- Promote AssertErrorsContainsMention from per-test-file private helpers to
  ProblemDetailsAssertions (closes batch-1 Low-severity DRY warning)
- Sync Swagger param descriptions, README, blackbox/security/perf scripts,
  uuidv5 doc with the new lat/lon/zoom query-param names

Docs
- system-flows.md F1/F2 reference the new contracts + validation layers
- modules/api_program.md adds Api/Validators + Api/DTOs sections
- _autodev_state.md: batch 2 of 4 complete; next batch = AZ-809

All smoke tests green (mode=smoke, exit 0). AZ-808 + AZ-811 transitioned
to In Testing on Jira.

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

_docs/02_document/tests/security-tests.md

@@ -2,7 +2,7 @@
 
 ## SEC-01: SQL Injection via Coordinate Parameters
 
-**Trigger**: GET /api/satellite/tiles/latlon?Latitude=1;DROP TABLE tiles--&Longitude=1&ZoomLevel=18
+**Trigger**: GET /api/satellite/tiles/latlon?lat=1;DROP TABLE tiles--&lon=1&zoom=18
 **Expected**: Request rejected or treated as invalid parameter
 **Pass criterion**: HTTP 400 or parameter parsing error; no database damage; tiles table intact
 
@@ -32,7 +32,7 @@ The pre-AZ-487 assumption "no authentication" is superseded by these scenarios.
 
 ## SEC-05: Anonymous Request to Any Authenticated Endpoint Returns 401
 
-**Trigger**: GET `/api/satellite/tiles/latlon?Latitude=...&Longitude=...&ZoomLevel=18` (or any `/api/satellite/*` endpoint) with NO `Authorization` header.
+**Trigger**: GET `/api/satellite/tiles/latlon?lat=...&lon=...&zoom=18` (or any `/api/satellite/*` endpoint) with NO `Authorization` header.
 **Precondition**: API running with `JWT_SECRET` configured.
 **Expected**: HTTP 401 Unauthorized; `WWW-Authenticate: Bearer` header present; response body does not leak validation internals.
 **Pass criterion**: status == 401 AND `WWW-Authenticate` header starts with `Bearer`.