feat(ai): 重构 AiState 集成 ProviderRegistry + QuotaService

AiState 新增 provider_registry 和 quota 字段
main.rs 启动时按配置注册 Claude/OpenAI/Ollama Provider
支持多 Provider 并发注册和健康检查

crates/erp-ai/src/state.rs

@@ -4,8 +4,10 @@ use erp_core::events::EventBus;
 use erp_core::health_provider::HealthDataProvider;
 use sea_orm::DatabaseConnection;
 
+use crate::provider::registry::ProviderRegistry;
 use crate::service::analysis::AnalysisService;
 use crate::service::prompt::PromptService;
+use crate::service::quota::QuotaService;
 use crate::service::suggestion::SuggestionService;
 use crate::service::usage::UsageService;
 
@@ -18,4 +20,6 @@ pub struct AiState {
     pub usage: Arc<UsageService>,
     pub suggestion: Arc<SuggestionService>,
     pub health_provider: Arc<dyn HealthDataProvider>,
+    pub provider_registry: Arc<ProviderRegistry>,
+    pub quota: Arc<QuotaService>,
 }