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

memory.py

@@ -1,5 +1,5 @@
 """
-JarvisChat - FTS5 memory system.
+cAIc - FTS5 memory system.
 CRUD, search, remember/forget command processing, topic detection.
 """
 import logging
@@ -10,7 +10,7 @@ from typing import Optional
 from db import get_db
 from config import MAX_MEMORY_FACT_CHARS
 
-log = logging.getLogger("jarvischat")
+log = logging.getLogger("caic")
 
 REMEMBER_PATTERNS = [
     (r"remember that (.+)", "explicit"),