[AZ-505] AC-5 fix: enable TLS for HTTP/2 via ALPN

Kestrel with HttpProtocols.Http1AndHttp2 on a plaintext listener
silently downgrades to HTTP/1.1-only (logs "HTTP/2 is not enabled
... TLS is not enabled"), so AC-5's multiplexed-GET test failed
with HTTP_1_1_REQUIRED. ALPN cannot run over plaintext, so the
fix switches the dev listener to TLS on https://+:8080:

- scripts/run-tests.sh generates a self-signed dev cert idempotently
  (./certs/api.pfx + api.crt) via openssl in an alpine container;
  certs/ is gitignored.
- docker-compose.yml binds Kestrel to ASPNETCORE_URLS=https://+:8080
  with Kestrel__Certificates__Default__Path bound to the .pfx.
- docker-compose.tests.yml mounts api.crt into the integration-tests
  container's CA store and runs update-ca-certificates so HttpClient
  trusts the cert transparently; default API_URL is now https://api:8080.
- Drop the obsolete Http2UnencryptedSupport AppContext switch from
  Http2MultiplexingTests; ALPN over TLS handles negotiation.

Test-data fixes caught on the post-TLS rerun (independent of the TLS
switch but surfaced together):

- Http2MultiplexingTests: switch slippy coords from (154321, 95812)
  -- which Google Maps returns 404 for -- to (158485, 91707), the
  slippy projection of (47.461747, 37.647063) already exercised by
  JwtIntegrationTests.
- TileInventoryTests + LeafletPathIndexOnlyTests: SpecifyKind to
  Unspecified at the binding site for raw Npgsql seed paths writing
  into tiles.captured_at / created_at / updated_at (TIMESTAMP without
  tz). Npgsql v6+ refuses Kind=Utc into plain timestamp columns;
  production goes through Dapper and never hits this code path.
- MigrationTests Az503NewUniqueIndexCoversIntegerKeyAndFlightId:
  accept either idx_tiles_location_hash (migration 014) or its
  AZ-505 successor tiles_leaflet_path (migration 015) -- both have
  location_hash as the leading column, which is the AC-9 intent.

Docs updated to reflect the TLS+ALPN path: tile-inventory.md
Non-Goals, modules/api_program.md, module-layout.md, the AZ-505
task spec's Risk 3, and the cycle 6 implementation + completeness
reports. The full integration test suite passes (mode=full, exit 0).

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

SatelliteProvider.IntegrationTests/LeafletPathIndexOnlyTests.cs

@@ -134,7 +134,7 @@ public static class LeafletPathIndexOnlyTests
         var locP = cmd.Parameters.Add("loc", NpgsqlTypes.NpgsqlDbType.Uuid);
 
         const int zoom = 18;
-        var baseTime = DateTime.UtcNow.AddDays(-1);
+        var baseTime = DateTime.SpecifyKind(DateTime.UtcNow.AddDays(-1), DateTimeKind.Unspecified);
         for (var i = 0; i < rowCount; i++)
         {
             var x = 100_000 + (i % 1024);
@@ -171,7 +171,7 @@ public static class LeafletPathIndexOnlyTests
         cmd.Parameters.AddWithValue("lat", 60.5);
         cmd.Parameters.AddWithValue("lon", 30.5);
         cmd.Parameters.AddWithValue("fp", "tiles/leaflet-probe.jpg");
-        cmd.Parameters.AddWithValue("t", DateTime.UtcNow);
+        cmd.Parameters.AddWithValue("t", DateTime.SpecifyKind(DateTime.UtcNow, DateTimeKind.Unspecified));
         cmd.Parameters.AddWithValue("loc", hash);
         await cmd.ExecuteNonQueryAsync();
     }