fix: temporarily disable routers to isolate Pydantic validation issue and add agent endpoints to working routers

- Comment out most routers in main.py to isolate Pydantic issue
- Keep only blockchain router enabled for testing
- Fix database warmup to use get_session() instead of SessionDep()
- Add blockchain router to __init__.py exports
- Add test endpoint to agent_router for verification
- Duplicate agent network and execution receipt endpoints in client and exchange routers as temporary workaround

cli/aitbc_cli/commands/blockchain.py

@@ -203,7 +203,7 @@ def sync_status(ctx):
     try:
         with httpx.Client() as client:
             response = client.get(
-                f"{config.coordinator_url}/v1/health",
+                f"{config.coordinator_url}/v1/sync-status",
                 headers={"X-Api-Key": config.api_key or ""}
             )