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

security.py

@@ -1,5 +1,5 @@
 """
-JarvisChat - Security utilities.
+cAIc - Security utilities.
 PIN hashing, audit logging, incident tracking, CSRF/origin checks,
 rate limiting, request helpers.
 """
@@ -30,7 +30,7 @@ from config import (
 
 import ipaddress
 
-log = logging.getLogger("jarvischat")
+log = logging.getLogger("caic")
 
 SESSIONS: dict = {}
 PIN_ATTEMPTS: dict = {}