Deprecate legacy feature flags, use ALWRITY_ENABLED_FEATURES only

- Remove fallback to ALWRITY_FEATURE_PROFILE, ALWRITY_ROUTER_PROFILE
- Primary env var is now ALWRITY_ENABLED_FEATURES (backend)
- Primary env var is REACT_APP_ENABLED_FEATURES (frontend)
- Add deprecation comments to all get_enabled_features() functions
- Update demoMode.ts with clear deprecation notes

Usage:
  ALWRITY_ENABLED_FEATURES=podcast      # Podcast only
  ALWRITY_ENABLED_FEATURES=all          # All features (default)

backend/alwrity_utils/router_manager.py

@@ -83,17 +83,16 @@ class RouterManager:
     
     @staticmethod
     def get_enabled_features() -> set:
-        """Get enabled features from environment variable.
+        """Get enabled features from ALWRITY_ENABLED_FEATURES env var.
         
-        ALWRITY_ENABLED_FEATURES can be:
+        Values:
         - "all" - enable all features (default)
-        - comma-separated list: "podcast,blog-writer,youtube"
+        - comma-separated: "podcast,blog-writer,youtube"
         - single feature: "podcast"
+        
+        DEPRECATED: ALWRITY_FEATURE_PROFILE, ALWRITY_ROUTER_PROFILE, ALWRITY_FEATURE_TO_ENABLE
         """
-        env_value = os.getenv(
-            "ALWRITY_ENABLED_FEATURES",
-            os.getenv("ALWRITY_FEATURE_PROFILE", os.getenv("ALWRITY_ROUTER_PROFILE", "all"))
-        ).strip().lower()
+        env_value = os.getenv("ALWRITY_ENABLED_FEATURES", "all").strip().lower()
         
         if not env_value or env_value == "all":
             return {"all"}

backend/app.py

@@ -60,17 +60,16 @@ def _env_flag_enabled(*env_names: str) -> bool:
 
 
 def get_enabled_features() -> set:
-    """Get enabled features from environment variable.
+    """Get enabled features from ALWRITY_ENABLED_FEATURES env var.
     
-    ALWRITY_ENABLED_FEATURES can be:
+    Values:
     - "all" - enable all features (default)
-    - comma-separated list: "podcast,core"
+    - comma-separated: "podcast,core"
     - single feature: "podcast"
+    
+    DEPRECATED: ALWRITY_FEATURE_PROFILE, ALWRITY_ROUTER_PROFILE, ALWRITY_FEATURE_TO_ENABLE
     """
-    env_value = os.getenv(
-        "ALWRITY_ENABLED_FEATURES",
-        os.getenv("ALWRITY_FEATURE_PROFILE", os.getenv("ALWRITY_ROUTER_PROFILE", "all"))
-    ).strip().lower()
+    env_value = os.getenv("ALWRITY_ENABLED_FEATURES", "all").strip().lower()
     
     if not env_value or env_value == "all":
         return {"all"}

backend/start_alwrity_backend.py

@@ -27,17 +27,16 @@ LINGUISTIC_REQUIRED_FEATURES = {"content_planning", "strategy_copilot", "faceboo
 
 
 def get_enabled_features() -> set:
-    """Get enabled features from environment variable.
+    """Get enabled features from ALWRITY_ENABLED_FEATURES env var.
     
-    ALWRITY_ENABLED_FEATURES can be:
+    Values:
     - "all" - enable all features (default)
-    - comma-separated list: "podcast,blog-writer,youtube"
+    - comma-separated: "podcast,blog-writer,youtube"
     - single feature: "podcast"
+    
+    DEPRECATED: ALWRITY_FEATURE_PROFILE, ALWRITY_ROUTER_PROFILE, ALWRITY_FEATURE_TO_ENABLE
     """
-    env_value = os.getenv(
-        "ALWRITY_ENABLED_FEATURES",
-        os.getenv("ALWRITY_FEATURE_PROFILE", os.getenv("ALWRITY_ROUTER_PROFILE", "all"))
-    ).strip().lower()
+    env_value = os.getenv("ALWRITY_ENABLED_FEATURES", "all").strip().lower()
     
     if not env_value or env_value == "all":
         return {"all"}
@@ -46,7 +45,7 @@ def get_enabled_features() -> set:
 
 
 def get_active_profile() -> str:
-    """Legacy function - returns primary profile for backwards compatibility."""
+    """Legacy function - use get_enabled_features() instead."""
     enabled = get_enabled_features()
     if "all" in enabled:
         return "all"

frontend/src/utils/demoMode.ts

@@ -1,22 +1,26 @@
 /**
  * Consolidated feature mode detection utilities.
  * 
- * Uses ALWRITY_ENABLED_FEATURES (backend) / REACT_APP_ENABLED_FEATURES (frontend)
- * Format: "all" or comma-separated features: "podcast,core"
+ * Primary: REACT_APP_ENABLED_FEATURES (format: "all" or "podcast,core")
+ * 
+ * DEPRECATED (fallback order):
+ * - REACT_APP_APP_MODE
+ * - REACT_APP_DEMO_MODE
+ * - REACT_APP_PODCAST_ONLY_DEMO_MODE
  */
 
 const ENABLED_FEATURES_STORAGE_KEYS = [
+  'enabled_features',  // Primary
   'app_mode',
-  'enabled_features',
   'demo_mode',
   'podcast_only_demo_mode',
 ];
 
 const ENABLED_FEATURES_ENV_KEYS = [
-  'REACT_APP_ENABLED_FEATURES',
-  'REACT_APP_APP_MODE',
-  'REACT_APP_DEMO_MODE',
-  'REACT_APP_PODCAST_ONLY_DEMO_MODE',
+  'REACT_APP_ENABLED_FEATURES',  // Primary - use this!
+  'REACT_APP_APP_MODE',           // DEPRECATED
+  'REACT_APP_DEMO_MODE',          // DEPRECATED
+  'REACT_APP_PODCAST_ONLY_DEMO_MODE', // DEPRECATED
 ];
 
 /**