feat(opencode-web-terminal): complete OpenCode web terminal implementation

- Update OpenCode compose template with web server on port 3000
- Add default_port=3000 and interfaces=[terminal, web] to OpenCode seed data
- Remove hardcoded 8080 fallback in tunnel creation
- Fail gracefully when tool type has no default_port configured
- Update frontend ToolType API to include default_port, category, interfaces
- Add port, category, and interfaces fields to tool type creation form
- Display port and interfaces in tool type cards
- Create migration 0012 to make default_port non-nullable
- Set default_port values for existing built-in tool types
- Quality gates: typecheck ✓, build ✓, Python syntax ✓

apps/web/src/api/tool_types.ts

@@ -20,6 +20,9 @@ export interface CreateToolTypeRequest {
   name: string;
   display_name: string;
   description?: string;
+  category?: string;
+  interfaces?: string[];
+  default_port: number;
   compose_template: string;
   required_variables: string[];
 }
@@ -27,6 +30,9 @@ export interface CreateToolTypeRequest {
 export interface UpdateToolTypeRequest {
   display_name?: string;
   description?: string;
+  category?: string;
+  interfaces?: string[];
+  default_port?: number;
   compose_template?: string;
   required_variables?: string[];
 }