Rename: jarvisChat → cAIc (product name)

- jarvisChat/JarvisChat/jarvischat → cAIc/cAIc/caic (branded/lower)
- JARVISCHAT_ env vars → CAIC_
- jc- script/config prefix → caic-
- jarvis_rag → caic_rag
- jarvischat.db / volumes → caic.db / caic_*
- AMQP vhost/user jarvischat → caic
- Syslog, loggers, docstrings all updated
- 47 files, zero stale references, 148 tests pass

routers/conversations.py

@@ -7,7 +7,7 @@ from db import get_db
 from security import read_json_body, BODY_LIMIT_DEFAULT_BYTES
 from config import DEFAULT_MODEL, MAX_CONVERSATION_TITLE_CHARS
 
-log = logging.getLogger("jarvischat")
+log = logging.getLogger("caic")
 router = APIRouter()