fix(state): add immutable created_source provenance column (#56439)

Gateway /resume rewrites sessions.source to the resuming platform, which is
correct routing behavior (source feeds find_latest_gateway_session_for_peer,
Telegram listings, and the TUI ghost pruner) but destroys creation
provenance. Add a separate immutable created_source column stamped once at
session creation and preserved by all upsert paths; surface it in
hermes sessions list as '<created>→<current>' when the two diverge.

Fixes #56439

hermes_state_common.py

@@ -362,6 +362,7 @@ CREATE TABLE IF NOT EXISTS system_prompts (
 CREATE TABLE IF NOT EXISTS sessions (
     id TEXT PRIMARY KEY,
     source TEXT NOT NULL,
+    created_source TEXT,
     user_id TEXT,
     session_key TEXT,
     chat_id TEXT,