feat(ai): Day 4 — 策略 Prompt 优化 + Tool 调用日志

- System Prompt 增加 10 个 Tool 的使用时机指引，Agent 自动选择最合适的 Tool
- 优先使用 get_health_insights 作为首次对话开场工具
- AgentRunResult 新增 tool_calls: Vec<ToolCallLog>，记录每次调用名称/耗时/成功状态
- ToolCallLog 将在 Phase 2 写入 ai_tool_call_logs 表

crates/erp-ai/src/agent/orchestrator.rs

@@ -6,6 +6,14 @@ use crate::dto::{ChatMessage, ChatMessageRole};
 use crate::error::AiResult;
 use crate::provider::AiProvider;
 
+/// 单次 Tool 调用日志
+#[derive(Debug, Clone)]
+pub struct ToolCallLog {
+    pub tool_name: String,
+    pub duration_ms: u64,
+    pub success: bool,
+}
+
 /// Agent 运行时参数
 pub struct AgentRunParams {
     pub model: String,
@@ -40,6 +48,7 @@ pub struct AgentRunResult {
     pub total_input_tokens: u32,
     pub total_output_tokens: u32,
     pub iterations: usize,
+    pub tool_calls: Vec<ToolCallLog>,
 }
 
 impl AgentOrchestrator {
@@ -66,6 +75,7 @@ impl AgentOrchestrator {
         let mut iterations = 0;
         let mut total_input_tokens = 0u32;
         let mut total_output_tokens = 0u32;
+        let mut tool_call_logs: Vec<ToolCallLog> = Vec::new();
 
         loop {
             iterations += 1;
@@ -96,6 +106,7 @@ impl AgentOrchestrator {
                         total_input_tokens,
                         total_output_tokens,
                         iterations,
+                        tool_calls: tool_call_logs,
                     });
                 }
             };
@@ -143,23 +154,30 @@ impl AgentOrchestrator {
 
             // 执行每个 Tool Call（受沙箱 allowed_tools 约束）
             for tc in &tool_calls {
-                let tool_result = match self.tool_registry.get(&tc.name) {
+                let start = std::time::Instant::now();
+                let (tool_result, success) = match self.tool_registry.get(&tc.name) {
                     Some(tool) => {
-                        // 沙箱过滤：如果 allowed_tools 存在且不包含此 Tool，拒绝执行
                         if let Some(allowed) = allowed_tools {
                             if !allowed.contains(tc.name.as_str()) {
-                                format!("Tool '{}' 在当前角色下不可用", tc.name)
+                                (format!("Tool '{}' 在当前角色下不可用", tc.name), false)
                             } else {
                                 let result = tool.execute(ctx, tc.arguments.clone()).await;
-                                result.output
+                                (result.output, true)
                             }
                         } else {
                             let result = tool.execute(ctx, tc.arguments.clone()).await;
-                            result.output
+                            (result.output, true)
                         }
                     }
-                    None => format!("未知 Tool: {}", tc.name),
+                    None => (format!("未知 Tool: {}", tc.name), false),
                 };
+                let duration = start.elapsed();
+
+                tool_call_logs.push(ToolCallLog {
+                    tool_name: tc.name.clone(),
+                    duration_ms: duration.as_millis() as u64,
+                    success,
+                });
 
                 messages.push(ChatMessage {
                     role: ChatMessageRole::Tool,