Implement Software Best Practices and Graceful API Key Management

- Integration of ruff, eslint, prettier for consistent code style
- Global error handling and structured logging in backend
- Comprehensive testing strategy with 100% pass rate (33 backend, 2 frontend)
- Graceful handling of missing Gemini API key (non-blocking startup)
- New /settings/status endpoint and UI warning indicators
- Full documentation update (ARCHITECTURE.md, CONTRIBUTING.md, README.md, GEMINI.md)
- Restored missing frontend logic and fixed UI syntax errors

backend/scripts/create_workout.py

@@ -1,13 +1,14 @@
-import sys
 import os
+import sys
 
 # Add src to path
 sys.path.append(os.path.abspath(os.path.join(os.path.dirname(__file__), "../src")))
 
-from garmin.sync import GarminSync
 from garmin.client import GarminClient
+from garmin.sync import GarminSync
 from garmin.workout import GarminWorkoutCreator, StrengthWorkout, WorkoutStep
 
+
 def get_common_exercises():
     """Extract common exercises from local Garmin history."""
     client = GarminClient() # path helper

backend/scripts/recommend.py

@@ -1,13 +1,14 @@
-import sys
 import os
+import sys
 
 # Add src to path
 sys.path.append(os.path.abspath(os.path.join(os.path.dirname(__file__), "../src")))
 
-from garmin.sync import GarminSync
 from garmin.client import GarminClient
+from garmin.sync import GarminSync
 from recommendations.engine import RecommendationEngine
 
+
 def main():
     print("🤖 Gemini Fitness AI")
     

backend/scripts/sync_garmin.py

@@ -1,6 +1,5 @@
-import sys
 import os
-from datetime import date
+import sys
 
 # Add src to path
 sys.path.append(os.path.abspath(os.path.join(os.path.dirname(__file__), "../src")))
@@ -8,6 +7,7 @@ sys.path.append(os.path.abspath(os.path.join(os.path.dirname(__file__), "../src"
 from garmin.client import GarminClient
 from garmin.sync import GarminSync
 
+
 def main():
     print("🚀 Initializing Garmin Sync...")
     client = GarminClient()