feat(devenv): add containerized development environment (#116)

* feat(devenv): add containerized development environment

Replace local-process dev workflow with a fully containerized stack
using docker compose. This enables consistent development across
machines without requiring local Go/Node toolchains or containerd.

- Add Dockerfile.server.dev with containerd + CNI networking support
- Add Dockerfile.web.dev for frontend dev server
- Add server-dev-entrypoint.sh for containerd lifecycle management
- Expand devenv/docker-compose.yml with server, agent, web, migrate
  and deps services with proper health checks and dependency ordering
- Update app.dev.toml to use container service names instead of localhost
- Refactor mise.toml dev tasks to drive docker compose workflow
- Support agent_gateway.server_addr in config package for inter-container
  communication

* feat(devenv): add hot-reload and registry mirror support

- Add air for Go server hot-reload in dev containers
- Fix agent_gateway host in dev config (0.0.0.0 -> agent)
- Add configurable registry mirror for China mainland users
- Unify MCP image refs via MCPConfig.ImageRef()

* feat(scripts): add China mainland mirror option to install script

Prompt users to opt-in to memoh.cn mirror during installation,
which applies docker-compose.cn.yml overlay and sets registry
in config.toml for MCP image pulls.

packages/config/src/index.ts

@@ -8,7 +8,7 @@ export const loadConfig = (path: string = './config.toml'): Config => {
 }
 
 export const getBaseUrl = (config: Config) => {
-  const rawAddr = typeof config.server.addr === 'string' ? config.server.addr.trim() : ''
+  const rawAddr = (config.agent_gateway?.server_addr || config.server?.addr || '').trim()
 
   if (!rawAddr) {
     return 'http://127.0.0.1'

packages/config/src/types.ts

@@ -61,6 +61,7 @@ export interface QdrantConfig {
 export interface AgentGatewayConfig {
   host: string;
   port: number;
+  server_addr?: string;
 }
 
 export interface WebConfig {