feat(ai): Agent SSE + Anthropic/responses tools + P1 确认写

- Agent 支持 SSE（步骤边推、正文分块），JSON 非流式 fallback
- tool calling 覆盖 openai-chat / anthropic / responses（单测解析回灌）
- P1：mcp.json mode=read_write 才可写；需 confirm_danger；Agent 剥离模型自带令牌
- GET /api/ai/mcp-status、POST /api/ai/agent/confirm；审计 source=mcp|agent

server/internal/ai/remote_tools_test.go

@@ -0,0 +1,72 @@
+package ai
+
+import (
+	"encoding/json"
+	"strings"
+	"testing"
+
+	"opsxdb/server/internal/aitools"
+)
+
+func TestParseToolsTurnAnthropic(t *testing.T) {
+	raw, _ := json.Marshal(map[string]any{
+		"stop_reason": "tool_use",
+		"content": []map[string]any{
+			{"type": "text", "text": "先列表"},
+			{"type": "tool_use", "id": "tu_1", "name": "opsxdb_list_tables", "input": map[string]any{"connection_id": "c1"}},
+		},
+	})
+	turn, err := parseToolsTurnAnthropic(raw, 200)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if turn.Content != "先列表" {
+		t.Fatalf("content=%q", turn.Content)
+	}
+	if len(turn.ToolCalls) != 1 || turn.ToolCalls[0].Function.Name != "opsxdb_list_tables" {
+		t.Fatalf("calls=%+v", turn.ToolCalls)
+	}
+	if !strings.Contains(turn.ToolCalls[0].Function.Arguments, "c1") {
+		t.Fatalf("args=%s", turn.ToolCalls[0].Function.Arguments)
+	}
+}
+
+func TestParseToolsTurnResponses(t *testing.T) {
+	raw, _ := json.Marshal(map[string]any{
+		"output": []map[string]any{
+			{"type": "function_call", "call_id": "call_9", "name": "opsxdb_execute_query", "arguments": `{"connection_id":"c1","sql":"SELECT 1"}`},
+			{"type": "message", "content": []map[string]any{{"type": "output_text", "text": "done"}}},
+		},
+	})
+	turn, err := parseToolsTurnResponses(raw, 200)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(turn.ToolCalls) != 1 || turn.ToolCalls[0].ID != "call_9" {
+		t.Fatalf("calls=%+v", turn.ToolCalls)
+	}
+	if turn.Content != "done" {
+		t.Fatalf("content=%q", turn.Content)
+	}
+}
+
+func TestOpenAIToolsToAnthropic(t *testing.T) {
+	tools := aitools.OpenAITools()
+	anth := openaiToolsToAnthropic(tools)
+	if len(anth) != len(tools) {
+		t.Fatalf("%d vs %d", len(anth), len(tools))
+	}
+	if anth[0]["name"] != tools[0].Function.Name {
+		t.Fatal(anth[0]["name"])
+	}
+	if anth[0]["input_schema"] == nil {
+		t.Fatal("missing input_schema")
+	}
+}
+
+func TestChunkDelta(t *testing.T) {
+	parts := chunkDelta("abcdefghij", 3)
+	if len(parts) != 4 {
+		t.Fatalf("%v", parts)
+	}
+}