feat(ai): 创建 erp-ai crate 骨架 + 错误类型

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

crates/erp-ai/src/error.rs

@@ -0,0 +1,59 @@
+use erp_core::error::AppError;
+
+#[derive(Debug, thiserror::Error)]
+pub enum AiError {
+    #[error("验证失败: {0}")]
+    Validation(String),
+
+    #[error("分析未找到: {0}")]
+    AnalysisNotFound(String),
+
+    #[error("Prompt 模板未找到: {0}")]
+    PromptNotFound(String),
+
+    #[error("AI 提供商不可用: {0}")]
+    ProviderUnavailable(String),
+
+    #[error("AI 提供商错误: {0}")]
+    ProviderError(String),
+
+    #[error("数据脱敏失败: {0}")]
+    SanitizationError(String),
+
+    #[error("模板渲染失败: {0}")]
+    TemplateError(String),
+
+    #[error("速率超限")]
+    RateLimitExceeded,
+
+    #[error("版本不匹配")]
+    VersionMismatch,
+
+    #[error("数据库错误: {0}")]
+    DbError(String),
+}
+
+impl From<AiError> for AppError {
+    fn from(e: AiError) -> Self {
+        match e {
+            AiError::Validation(msg) => AppError::Validation(msg),
+            AiError::AnalysisNotFound(id) => AppError::NotFound(format!("分析结果: {id}")),
+            AiError::PromptNotFound(name) => AppError::NotFound(format!("Prompt 模板: {name}")),
+            AiError::ProviderUnavailable(p) => {
+                AppError::Internal(format!("AI 提供商 {p} 不可用"))
+            }
+            AiError::RateLimitExceeded => AppError::TooManyRequests,
+            AiError::VersionMismatch => AppError::VersionMismatch,
+            AiError::DbError(msg) => AppError::Internal(msg),
+            other => AppError::Internal(other.to_string()),
+        }
+    }
+}
+
+impl From<sea_orm::DbErr> for AiError {
+    fn from(e: sea_orm::DbErr) -> Self {
+        AiError::DbError(e.to_string())
+    }
+}
+
+pub type AiResult<T> = Result<T, AiError>;