feat: implement tool workshop - comprehensive tool system enhancement

- Add Docker Compose and Dockerfile support for tool definitions
- Implement readiness probes with configurable command, timeout, interval
- Create ConfigFolder model for reusable file collections with project overrides
- Add rich tool config fields: port_override, start_command, working_directory, env vars, volumes
- Build unified Tool Workshop UI at /tool-workshop replacing /tool-configs and /tool-types
- Update instance creation to support dockerfile builds, config folder mounting, readiness probes
- Add 3 database migrations for tool_types, tool_configs, and new config_folders table
- Create docker_build.py and readiness_probe.py services
- Add config_folders API with CRUD and project override endpoints

Quality gates: frontend build passes, Python syntax valid, all phases complete

Addresses tool-workshop OpenSpec change

apps/web/src/api/tool_configs.ts

@@ -8,6 +8,11 @@ export interface ToolConfig {
   value: string;
   config_type: string;
   file_path: string | null;
+  port_override: number | null;
+  start_command: string | null;
+  working_directory: string | null;
+  environment_variables: Record<string, string> | null;
+  volumes: Array<{ source: string; target: string; type?: string }> | null;
 }
 
 export interface CreateToolConfigRequest {
@@ -17,6 +22,11 @@ export interface CreateToolConfigRequest {
   value: string;
   config_type?: string;
   file_path?: string;
+  port_override?: number;
+  start_command?: string;
+  working_directory?: string;
+  environment_variables?: Record<string, string>;
+  volumes?: Array<{ source: string; target: string; type?: string }>;
 }
 
 export const listToolConfigs = async (
@@ -53,4 +63,13 @@ export const updateToolConfig = async (
 
 export const deleteToolConfig = async (id: string): Promise<void> => {
   await apiClient.delete(`/tool-configs/${id}`);
+};
+
+export const getToolConfigDefaults = async (
+  toolTypeId: string
+): Promise<ToolConfig> => {
+  const response = await apiClient.get<ToolConfig>(
+    `/tool-configs/defaults/${toolTypeId}`
+  );
+  return response.data;
 };