refactor: 统一 expect 断言体系，引入共享 ValueMatcher/ContentRules/KeyValueExpect 模型

- 引入共享 ValueMatcher（equals/contains/regex/exists/empty/gt/gte/lt/lte）
- 引入共享 ContentRules 数组（direct/json/css/xpath 提取器）
- 引入共享 KeyValueExpect（动态键值断言，字面量等价 equals）
- maxDurationMs → durationMs: ValueMatcher（所有 checker）
- match → regex（固定无 flags）
- Ping max* → packetLossPercent/avgLatencyMs/maxLatencyMs（ValueMatcher）
- LLM finishReason/rawFinishReason → ValueMatcher
- DB 新增 result: ContentRules
- TCP banner → ContentRules 数组
- 删除旧模块：operator.ts、validate-operator.ts、duration.ts、body.ts、text.ts、output.ts
- 更新全部 checker schema/validate/expect/execute
- 更新 probe-config.schema.json、probes.example.yaml
- 更新 README.md、DEVELOPMENT.md（含 expect 字段选择规范）
- 同步 10 个 delta specs 到主 specs，归档 change

tests/server/checker/runner/http/runner.test.ts

@@ -487,7 +487,7 @@ describe("HttpChecker", () => {
     expect(result.durationMs!).toBeGreaterThanOrEqual(0);
   });
 
-  test("expect.maxDurationMs 使用完整耗时", async () => {
+  test("expect.durationMs 使用完整耗时", async () => {
     const slowServer = Bun.serve({
       async fetch() {
         await new Promise((resolve) => setTimeout(resolve, 50));
@@ -498,7 +498,7 @@ describe("HttpChecker", () => {
     try {
       const result = await checker.execute(
         makeTarget({
-          expect: { body: [{ contains: "x" }], maxDurationMs: 10 },
+          expect: { body: [{ contains: "x" }], durationMs: { lte: 10 } },
           url: `http://localhost:${slowServer.port}/`,
         }),
         makeCtx(),
@@ -521,7 +521,7 @@ describe("HttpChecker", () => {
   test("body 失败优先于 duration 检查", async () => {
     const result = await checker.execute(
       makeTarget({
-        expect: { body: [{ contains: "nonexistent" }], maxDurationMs: 999999 },
+        expect: { body: [{ contains: "nonexistent" }], durationMs: { lte: 999999 } },
         url: `${baseUrl}/ok`,
       }),
       makeCtx(),
@@ -689,7 +689,7 @@ describe("HttpChecker", () => {
       name: "test",
       type: "http",
     });
-    expect(errors).toContain("缺少支持的规则类型");
+    expect(errors).toContain("match 是未知字段");
   });
 
   test("非法 regex 启动校验失败", () => {
@@ -722,19 +722,19 @@ describe("HttpChecker", () => {
     expect(errors).toContain("json.path");
   });
 
-  test("非法 operator match 启动校验失败", () => {
+  test("旧 match matcher 启动校验失败", () => {
     const errors = validateHttpTarget({
       expect: { headers: { "x-test": { match: "[invalid" } } },
       http: { url: "https://example.com" },
       name: "test",
       type: "http",
     });
-    expect(errors).toContain("match 正则不合法");
+    expect(errors).toContain("match 是未知 matcher");
   });
 
-  test("ReDoS operator match 启动校验失败", () => {
+  test("ReDoS regex matcher 启动校验失败", () => {
     const errors = validateHttpTarget({
-      expect: { headers: { "x-test": { match: "(\\d+)*x" } } },
+      expect: { headers: { "x-test": { regex: "(\\d+)*x" } } },
       http: { url: "https://example.com" },
       name: "test",
       type: "http",
@@ -769,17 +769,17 @@ describe("HttpChecker", () => {
       name: "test",
       type: "http",
     });
-    expect(errors).toContain("必须包含至少一个合法 operator");
+    expect(errors).toContain("必须包含至少一个合法 matcher");
   });
 
   test("body rule 多个支持字段启动失败", () => {
     const errors = validateHttpTarget({
-      expect: { body: [{ contains: "ok", regex: "ok" }] },
+      expect: { body: [{ contains: "ok", json: { path: "$.status" } }] },
       http: { url: "https://example.com" },
       name: "test",
       type: "http",
     });
-    expect(errors).toContain("只能配置一种规则类型");
+    expect(errors).toContain("直接 matcher 不能与 extractor 混用");
   });
 
   test("body rule 缺少支持字段启动失败", () => {
@@ -789,7 +789,7 @@ describe("HttpChecker", () => {
       name: "test",
       type: "http",
     });
-    expect(errors).toContain("缺少支持的规则类型");
+    expect(errors).toContain("foo 是未知字段");
   });
 
   test("css selector 为空启动失败", () => {