feat: terminal startup command and container tools

- Add startup_command field to ToolType model and API
- Execute startup command before interactive shell in terminal sessions
- Add tmux and ranger to OpenCode container spec
- Update Tool Workshop UI with startup_command input for terminal types
- Add backend tests for startup_command CRUD operations
- Sync specs: tool-terminal, tool-types-definition, opencode-web-server
- New spec: tool-terminal-startup-command

Quality gates: Frontend typecheck/lint passed. Backend tests blocked by environment (Python/Docker not available).

OpenSpec: terminal-startup-and-container-tools

apps/api/src/services/terminal_manager.py

@@ -58,6 +58,7 @@ class TerminalManager:
         self,
         instance_id: uuid.UUID,
         container_id: str,
+        startup_command: str | None = None,
     ) -> TerminalSession:
         """Get existing session or create a new one."""
         # Ensure idle check is running (lazy start)
@@ -82,8 +83,8 @@ class TerminalManager:
         # Create new session
         logger.info("Creating new terminal session for instance %s", instance_id)
         session_id = str(uuid.uuid4())
-        session = TerminalSession(session_id, instance_id, container_id)
-        await session.start()
+        session = TerminalSession(session_id, instance_id, container_id, startup_command=startup_command)
+        await session.start(startup_command=startup_command)
         self._sessions[instance_id_str] = session
         
         return session
@@ -127,6 +128,7 @@ class TerminalManager:
         self,
         instance_id: uuid.UUID,
         container_id: str,
+        startup_command: str | None = None,
     ) -> TerminalSession:
         """Reset a session by killing it and creating a new one."""
         instance_id_str = str(instance_id)
@@ -139,8 +141,8 @@ class TerminalManager:
         
         # Create new session
         session_id = str(uuid.uuid4())
-        session = TerminalSession(session_id, instance_id, container_id)
-        await session.start()
+        session = TerminalSession(session_id, instance_id, container_id, startup_command=startup_command)
+        await session.start(startup_command=startup_command)
         self._sessions[instance_id_str] = session
         
         return session