first pass async feedback complete, regressions added

backend/app/core/config.py

@@ -52,8 +52,8 @@ class Settings(BaseSettings):
     # Data File Names (relative to DATA_DIR)
     PROMPTS_HISTORIC_FILE: str = "prompts_historic.json"
     PROMPTS_POOL_FILE: str = "prompts_pool.json"
-    FEEDBACK_WORDS_FILE: str = "feedback_words.json"
     FEEDBACK_HISTORIC_FILE: str = "feedback_historic.json"
+    # Note: feedback_words.json is deprecated and merged into feedback_historic.json
 
     @validator("BACKEND_CORS_ORIGINS", pre=True)
     def assemble_cors_origins(cls, v: str | List[str]) -> List[str] | str: