feat: implement tool types definition system

- Add ToolType SQLAlchemy model with Docker Compose template support
- Create CRUD API endpoints for tool type management
- Implement YAML and template variable validation
- Add built-in tool types (code-server, jupyter-notebook) seeded on startup
- Create frontend page with list, create, edit, and delete functionality
- Add tool types navigation to app shell
- Update mypy config to ignore missing imports

Quality gates: ruff (passed), mypy (passed), pytest unit (8 passed),
typecheck (passed), lint (passed), build (passed)

apps/web/src/api/tool_types.ts

@@ -0,0 +1,53 @@
+import { apiClient } from "./client";
+
+export interface ToolType {
+  id: string;
+  name: string;
+  display_name: string;
+  description: string | null;
+  compose_template: string;
+  required_variables: string[];
+  is_builtin: boolean;
+  created_by_id: string | null;
+  created_at: string;
+  updated_at: string;
+}
+
+export interface CreateToolTypeRequest {
+  name: string;
+  display_name: string;
+  description?: string;
+  compose_template: string;
+  required_variables: string[];
+}
+
+export interface UpdateToolTypeRequest {
+  display_name?: string;
+  description?: string;
+  compose_template?: string;
+  required_variables?: string[];
+}
+
+export const listToolTypes = async (): Promise<ToolType[]> => {
+  const response = await apiClient.get<ToolType[]>("/tool-types");
+  return response.data;
+};
+
+export const getToolType = async (id: string): Promise<ToolType> => {
+  const response = await apiClient.get<ToolType>(`/tool-types/${id}`);
+  return response.data;
+};
+
+export const createToolType = async (data: CreateToolTypeRequest): Promise<ToolType> => {
+  const response = await apiClient.post<ToolType>("/tool-types", data);
+  return response.data;
+};
+
+export const updateToolType = async (id: string, data: UpdateToolTypeRequest): Promise<ToolType> => {
+  const response = await apiClient.put<ToolType>(`/tool-types/${id}`, data);
+  return response.data;
+};
+
+export const deleteToolType = async (id: string): Promise<void> => {
+  await apiClient.delete(`/tool-types/${id}`);
+};