Add flight comparator web app with full scan pipeline

Full-stack flight price scanner built on fast-flights v3 (SOCS cookie bypass):

Backend (FastAPI + SQLite):
- REST API with rate limiting, Pydantic v2 validation, paginated responses
- Scan pipeline: resolves airports, queries every day in the window, saves
  individual flights + aggregate route stats to SQLite
- Background async scan processor with real-time progress tracking
- Airport search endpoint backed by OpenFlights dataset
- Daily scan window (all dates, not monthly samples)

Frontend (React 19 + TypeScript + Tailwind CSS v4):
- Dashboard with live scan status and recent scans
- Create scan form: country mode or specific airports (searchable dropdown)
- Scan detail page with expandable route rows showing individual flights
  (date, airline, departure, arrival, price) loaded on demand
- AirportSearch component with debounced live search and multi-select

Database:
- scans → routes → flights schema with FK cascade and auto-update triggers
- Migrations for schema evolution (relaxed country constraint)

Tests:
- 74 tests: unit + integration, isolated per-test SQLite DB
- Confirmed flight fixtures in tests/confirmed_flights.json (50 real flights,
  BDS→FMM Ryanair + BDS→DUS Eurowings, scraped Feb 2026)
- Integration tests parametrized from confirmed routes

Docker:
- Multi-stage builds, Compose orchestration, Nginx reverse proxy

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

flight-comparator/pytest.ini

@@ -0,0 +1,51 @@
+[pytest]
+# Pytest configuration for Flight Radar Web App
+
+# Test discovery patterns
+python_files = test_*.py
+python_classes = Test*
+python_functions = test_*
+
+# Test directory
+testpaths = tests
+
+# Output options
+addopts =
+    # Verbose output
+    -v
+    # Show summary of all test outcomes
+    -ra
+    # Show local variables in tracebacks
+    --showlocals
+    # Strict markers (fail on unknown markers)
+    --strict-markers
+    # Capture output (show print statements only on failure)
+    --capture=no
+    # Disable warnings summary
+    --disable-warnings
+    # Coverage options (for pytest-cov)
+    --cov=.
+    --cov-report=term-missing
+    --cov-report=html
+    --cov-config=.coveragerc
+
+# Asyncio mode
+asyncio_mode = auto
+
+# Markers for categorizing tests
+markers =
+    unit: Unit tests (fast, isolated)
+    integration: Integration tests (slower, multiple components)
+    slow: Slow tests (may take several seconds)
+    database: Tests that interact with database
+    api: Tests for API endpoints
+    validation: Tests for input validation
+    error_handling: Tests for error handling
+    rate_limit: Tests for rate limiting
+    pagination: Tests for pagination
+
+# Ignore directories
+norecursedirs = .git .venv venv env __pycache__ *.egg-info dist build
+
+# Test output
+console_output_style = progress