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/router.tsx

@@ -9,6 +9,7 @@ import { ProjectsPage } from "./pages/projects";
 import { GitRepositoriesPage } from "./pages/git-repositories";
 import { SSHKeysPage } from "./pages/ssh-keys";
 import { SettingsPage } from "./pages/settings";
+import { ToolTypesPage } from "./pages/tool-types";
 
 export const AppRouter = () => {
   return (
@@ -28,6 +29,7 @@ export const AppRouter = () => {
         <Route path="ssh-keys" element={<SSHKeysPage />} />
         <Route path="profile" element={<ProfilePage />} />
         <Route path="settings" element={<SettingsPage />} />
+        <Route path="tool-types" element={<ToolTypesPage />} />
       </Route>
       <Route path="/404" element={<NotFoundPage />} />
       <Route path="*" element={<Navigate to="/404" replace />} />