feat(ai): AiProvider trait + Claude SSE 流式实现 + DTO 定义

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

crates/erp-ai/src/dto.rs

@@ -0,0 +1,102 @@
+use serde::{Deserialize, Serialize};
+
+// === 分析请求 ===
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct AnalyzeRequest {
+    pub analysis_type: AnalysisType,
+    pub source_ref: String,
+    pub options: AnalyzeOptions,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
+#[serde(rename_all = "snake_case")]
+pub enum AnalysisType {
+    LabReport,
+    Trends,
+    CheckupPlan,
+    ReportSummary,
+}
+
+impl AnalysisType {
+    pub fn as_str(&self) -> &str {
+        match self {
+            Self::LabReport => "lab_report",
+            Self::Trends => "trend",
+            Self::CheckupPlan => "checkup_plan",
+            Self::ReportSummary => "report_summary",
+        }
+    }
+
+    pub fn prompt_name(&self) -> &str {
+        match self {
+            Self::LabReport => "lab_report_interpretation",
+            Self::Trends => "health_trend_analysis",
+            Self::CheckupPlan => "personalized_checkup_plan",
+            Self::ReportSummary => "report_summary_generation",
+        }
+    }
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct AnalyzeOptions {
+    pub detail_level: Option<String>,
+    pub language: Option<String>,
+}
+
+impl Default for AnalyzeOptions {
+    fn default() -> Self {
+        Self {
+            detail_level: Some("patient_friendly".into()),
+            language: Some("zh-CN".into()),
+        }
+    }
+}
+
+// === AI Provider 请求/响应 ===
+
+#[derive(Debug, Clone)]
+pub struct GenerateRequest {
+    pub system_prompt: String,
+    pub user_prompt: String,
+    pub model: String,
+    pub temperature: f32,
+    pub max_tokens: u32,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct GenerateResponse {
+    pub content: String,
+    pub model: String,
+    pub input_tokens: u32,
+    pub output_tokens: u32,
+    pub duration_ms: u64,
+}
+
+// === SSE 事件 ===
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct TokenUsage {
+    pub input: u32,
+    pub output: u32,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(tag = "type")]
+pub enum AnalysisSseEvent {
+    #[serde(rename = "chunk")]
+    Chunk { content: String, index: u32 },
+    #[serde(rename = "metadata")]
+    Metadata {
+        model: String,
+        tokens: TokenUsage,
+        duration_ms: u64,
+    },
+    #[serde(rename = "done")]
+    Done {
+        analysis_id: uuid::Uuid,
+        status: String,
+    },
+    #[serde(rename = "error")]
+    Error { message: String },
+}