feat(agent): add index bootstrap and answer feedback

agent/config.py

@@ -92,6 +92,13 @@ class Config:
     api_key: str = ""          # leer = nur fuer lokale Entwicklung ohne Auth
     admin_api_key: str = ""    # leer = api_key auch fuer /reindex verwenden
 
+    # Audit / Feedback (Inhalte koennen personenbezogene Freitexte enthalten)
+    audit_enabled: bool = False
+    audit_db_path: str = "data/audit.db"
+    audit_log_content: bool = True
+    audit_stdout: bool = False
+    audit_retention_days: int = 30
+
     @classmethod
     def from_env(cls) -> Config:
         d = cls()
@@ -126,4 +133,11 @@ class Config:
             port=_env_int("PV_PORT", d.port),
             api_key=_env_str("PV_API_KEY", d.api_key),
             admin_api_key=_env_str("PV_ADMIN_API_KEY", d.admin_api_key),
+            audit_enabled=_env_bool("PV_AUDIT_ENABLED", d.audit_enabled),
+            audit_db_path=_env_str("PV_AUDIT_DB_PATH", d.audit_db_path),
+            audit_log_content=_env_bool("PV_AUDIT_LOG_CONTENT", d.audit_log_content),
+            audit_stdout=_env_bool("PV_AUDIT_STDOUT", d.audit_stdout),
+            audit_retention_days=_env_int(
+                "PV_AUDIT_RETENTION_DAYS", d.audit_retention_days
+            ),
         )