chore: clean up debugging logs and console prints

Frontend:
- Remove 18 console.log/warn/error statements from terminal.tsx
- Remove console.warn from icon.tsx

Backend:
- Downgrade routine logger.info to logger.debug in tool_instances.py, terminal.py,
  terminal_session.py, terminal_manager.py, auth.py, docker_build.py, clone.py,
  config_profiles.py, user_config.py
- Keep important lifecycle events as logger.info:
  * Instance creation, start, running state
  * Docker build success/failure
  * Terminal session creation and reset
  * Auth success and user creation
  * Readiness probe success
  * Tunnel creation/stop

apps/api/src/services/terminal_manager.py

@@ -72,11 +72,11 @@ class TerminalManager:
             
             # Check if session is still alive
             if session.is_alive():
-                logger.info("Reattaching to existing terminal session for instance %s", instance_id)
+                logger.debug("Reattaching to existing terminal session for instance %s", instance_id)
                 return session
             else:
                 # Session died, clean it up
-                logger.info("Existing session for instance %s is dead, cleaning up", instance_id)
+                logger.debug("Existing session for instance %s is dead, cleaning up", instance_id)
                 await session.close()
                 del self._sessions[instance_id_str]
         
@@ -97,7 +97,7 @@ class TerminalManager:
         """Attach a WebSocket to an existing session."""
         # Handle concurrent connections - close existing ones
         if session.has_websockets():
-            logger.info("Closing existing WebSocket connections for instance %s", session.instance_id)
+            logger.debug("Closing existing WebSocket connections for instance %s", session.instance_id)
             for ws in list(session._websockets):
                 try:
                     await ws.close(code=4000, reason="New connection established")
@@ -135,7 +135,7 @@ class TerminalManager:
         
         # Close existing session if any
         if instance_id_str in self._sessions:
-            logger.info("Resetting terminal session for instance %s", instance_id)
+            logger.debug("Resetting terminal session for instance %s", instance_id)
             old_session = self._sessions.pop(instance_id_str)
             await old_session.close()