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/web/src/api/tool_types.ts

@@ -20,6 +20,7 @@ export interface ToolType {
   dockerfile_template: string | null;
   build_context: Record<string, string> | null;
   readiness_probe: ReadinessProbe | null;
+  startup_command: string | null;
   required_variables: string[];
   created_by_id: string | null;
   created_at: string;
@@ -39,6 +40,7 @@ export interface CreateToolTypeRequest {
   dockerfile_template?: string;
   build_context?: Record<string, string>;
   readiness_probe?: ReadinessProbe;
+  startup_command?: string;
   required_variables: string[];
 }
 
@@ -54,6 +56,7 @@ export interface UpdateToolTypeRequest {
   dockerfile_template?: string;
   build_context?: Record<string, string>;
   readiness_probe?: ReadinessProbe;
+  startup_command?: string;
   required_variables?: string[];
 }