fix(initial-implementation): close P2/P3/P5 review blockers — 185/185 tests green

Combined-batch reviewer flagged three real blockers + two test-infra
issues across the parallel P2/P3/P5 batch. All resolved:

PHASE 3 — DateTimeOffset UTC-kind constructor (3 sites)
  EventListingParserBase.cs:39, EventOddsParser.cs:72, ResultsParser.cs:104
  Replaced `new DateTimeOffset(DateTimeOffset.UtcNow.UtcDateTime, MoscowOffset)`
  (throws ArgumentException because UtcDateTime has Kind=Utc) with
  `DateTimeOffset.UtcNow.ToOffset(MoscowOffset)`.

PHASE 2 — EF string.Compare not translatable (3 sites)
  EventRepository.cs:34, SnapshotRepository.cs:46, ExcelExporter.cs:35
  Replaced `string.Compare(col, str, StringComparison.Ordinal)` with
  `col.CompareTo(str)` so EF Core's SQLite provider can translate the
  expression. Semantics unchanged (SQLite default collation = BINARY = ordinal).

PHASE 3 — ServerTimeProvider regex misses JSON-quoted key
  Regex `serverTime\s*:\s*"..."` only matched bare-key form. Updated to
  `"?serverTime"?\s*:\s*"..."` so the JSON-quoted form (the actual
  marathonbet.by production format) is matched.

PHASE 3 — fixture: orphan <td> elements stripped by HTML5 parser
  tests/.../Fixtures/marathonbet/event-football-sample.html — wrapped
  the <td> blocks in a proper <table><tbody><tr> hierarchy so AngleSharp
  preserves them and `td.Closest("td")` succeeds in the parser.

PHASE 2 — InMemoryDbFixture shared state across parallel tests
  All fixture instances used `Data Source=marathon_tests` causing xUnit's
  parallel-within-class runs to contaminate each other's data. Each fixture
  now uses a Guid-suffixed unique data source name.

PLAN.md — P2/P3/P5 rows updated to ✅ Done with batch commit reference.

Test status:
  Domain.Tests:         96/96 ✅
  Application.Tests:     1/1  ✅
  Infrastructure.Tests: 77/77 ✅
  UI.Tests:             11/11 ✅
  TOTAL:               185/185 ✅
Build: 0 warnings, 0 errors.

Deferred to later phases (per reviewer 🟡 / 🔵 notes):
- SnapshotRepository.GetAsync(Guid) uses lossy GetHashCode workaround;
  Phase 4 to fix or remove from interface.
- Excel Sport name column writes string.Empty (need lookup join in Phase 6).
- PeriodScopeMapper football n>2 falls through to "Quarter" token;
  guarded by MaxPeriods today, but defensive cleanup at Phase 9.
- Settings.razor duplicate m-rise-5 class on Localization section.

plans/initial-implementation/PLAN.md

@@ -64,10 +64,10 @@ parameter configurable.
 |---|---|---|---|---|---|
 | Phase 0: Scraping spike | backend | ✅ Done | ⚠️ Pass with notes (Sonnet) | ⏭️ N/A (research) | ✅ 070e34b |
 | Phase 1: Solution + Domain | backend | ✅ Done | ⚠️ Pass with notes (Sonnet) | ✅ Build OK + 96/96 Domain tests | ✅ 61114ea |
-| Phase 2: Storage | backend | 🔨 Code done, not committed | ⬜ Pending | ⏭️ Big Bang (own code 0/0) | ⬜ WIP |
-| Phase 3: Scraping | backend | 🔨 Code done, not committed | ⬜ Pending | ⏭️ Big Bang (own code 0/0) | ⬜ WIP |
+| Phase 2: Storage | backend | ✅ Done | ⚠️ Pass with notes (Sonnet, combined batch) | ✅ Build OK + 77/77 Infra tests | ✅ batch (e4d8476…686550d…+) |
+| Phase 3: Scraping | backend | ✅ Done | ⚠️ Pass with notes (Sonnet, combined batch) | ✅ Build OK + 77/77 Infra tests | ✅ batch (e4d8476…686550d…+) |
 | Phase 4: Application + Workers | backend | ⬜ Not Started | ⬜ | ⏭️ Big Bang | ⬜ |
-| Phase 5: Host + Theme + i18n | frontend | 🔨 ~95% (killed mid-final-verify) | ⬜ Pending | ⏭️ Big Bang | ⬜ WIP |
+| Phase 5: Host + Theme + i18n | frontend | ✅ Done | ⚠️ Pass with notes (Sonnet, combined batch) | ✅ Build OK + 11/11 UI tests | ✅ batch (e4d8476…686550d…+) |
 | Phase 6: Event browsing UI | frontend | ⬜ Not Started | ⬜ | ⏭️ Big Bang | ⬜ |
 | Phase 7: Anomaly detection | fullstack | ⬜ Not Started | ⬜ | ⏭️ Big Bang | ⬜ |
 | Phase 8: Results loader | fullstack | ⬜ Not Started | ⬜ | ⏭️ Big Bang | ⬜ |