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

tests/test_settings_allowlist.py

@@ -9,8 +9,8 @@ from security import SESSIONS, PIN_ATTEMPTS
 
 
 def make_admin_client(tmp_path: Path) -> tuple[TestClient, dict[str, str]]:
-    os.environ["JARVISCHAT_ADMIN_PIN"] = "1234"
-    db.DB_PATH = tmp_path / "jarvischat-settings.db"
+    os.environ["CAIC_ADMIN_PIN"] = "1234"
+    db.DB_PATH = tmp_path / "caic-settings.db"
     SESSIONS.clear()
     PIN_ATTEMPTS.clear()
     db.init_db()