feat(server): erp-ai 模块集成 — Config/State/路由注册

- 新增 AiConfig 到 AppConfig
- 新增 FromRef<AppState> for AiState
- 注册 AiModule 到 ModuleRegistry
- 合并 AI protected routes
- 修复 sync_module_permissions 只同步 health.% 的 bug

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

crates/erp-server/config/default.toml

@@ -32,3 +32,13 @@ secret = "__MUST_SET_VIA_ENV__"
 [health]
 aes_key = "__MUST_SET_VIA_ENV__"
 hmac_key = "__MUST_SET_VIA_ENV__"
+
+[ai]
+default_provider = "claude"
+api_key = ""
+base_url = "https://api.anthropic.com"
+model = "claude-sonnet-4-6"
+max_tokens = 2048
+temperature = 0.3
+cache_ttl_seconds = 604800
+rate_limit_patient_daily = 10