Fix configuration architecture: Add dotenv loading and use app.config consistently

Address architectural inconsistency where environment variables were used
directly instead of through Flask's configuration system.

Issues Fixed:
1. .env file was never loaded - load_dotenv() was missing
2. Routes used os.getenv() directly instead of app.config
3. ANTHROPIC_API_KEY was defined in config but not used properly

Changes:
- config/development.py: Added load_dotenv() at module level
- app/routes/submission.py: Changed os.getenv() to current_app.config.get()
- app/routes/dashboard.py: Changed os.getenv() to current_app.config.get()

Benefits:
- Proper separation of concerns (config vs code)
- .env files now work as expected in development
- Easier to test (can mock app.config)
- Consistent with Flask best practices
- Production env vars still work (no dotenv in production config)

Configuration Flow:
Development: .env → load_dotenv() → os.environ → DevelopmentConfig → app.config
Production:  System env vars → os.environ → ProductionConfig → app.config
Application: app.config.get('ANTHROPIC_API_KEY')

All 49 tests passing (1 skipped)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

app/routes/dashboard.py

@@ -248,11 +248,11 @@ def trigger_analysis(feedback_id):
             actual_product_id, feedback_id, 'analyzing'
         )
 
-        # Get API key from environment
+        # Get API key from app configuration
-        api_key = os.getenv('ANTHROPIC_API_KEY')
+        api_key = current_app.config.get('ANTHROPIC_API_KEY')
 
         if not api_key:
-            raise Exception("ANTHROPIC_API_KEY not configured")
+            raise Exception("ANTHROPIC_API_KEY not configured in app settings")
 
         # Initialize analyzer
         analyzer = ClaudeAnalyzer(api_key=api_key)

app/routes/submission.py

@@ -146,11 +146,11 @@ def _analyze_feedback_background(app, product_id, feedback_id, feedback_text, ta
                 product_id, feedback_id, 'analyzing'
             )
 
-            # Get API key from environment
+            # Get API key from app configuration
-            api_key = os.getenv('ANTHROPIC_API_KEY')
+            api_key = current_app.config.get('ANTHROPIC_API_KEY')
 
             if not api_key:
-                raise Exception("ANTHROPIC_API_KEY not configured")
+                raise Exception("ANTHROPIC_API_KEY not configured in app settings")
 
             # Initialize analyzer
             analyzer = ClaudeAnalyzer(api_key=api_key)

config/development.py

@@ -1,5 +1,9 @@
 """Development configuration"""
 import os
+from dotenv import load_dotenv
+
+# Load .env file for development
+load_dotenv()
 
 class DevelopmentConfig:
     """Development environment configuration"""