refactor: unify StartToolModal — remove inline duplicate from workspace detail

- Delete inline hardcoded StartToolModal from workspace-detail.tsx
- Import shared StartToolModal that fetches real tool types from API
- Pass workspace object to ToolsTab so shared modal gets proper context
- onStart handler passes optional configProfileId through to useWorkspaceInstances.create()

Quality gates: tsc --noEmit clean

apps/web/src/components/start-tool-modal.tsx

@@ -76,9 +76,7 @@ export function StartToolModal({
 						{status === "loading" && (
 							<span className="muted">Loading tools...</span>
 						)}
-						{loadError && (
-							<span className="error-text">{loadError}</span>
-						)}
+						{loadError && <span className="error-text">{loadError}</span>}
 					</div>
 					<div className="form-group">
 						<label htmlFor="config-profile">Config Profile (optional)</label>