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/tcp/expect.test.ts

@@ -32,34 +32,34 @@ describe("checkConnected", () => {
 
 describe("checkBanner", () => {
   test("contains 匹配", () => {
-    const result = checkBanner("220 smtp.example.com ESMTP", { contains: "ESMTP" });
+    const result = checkBanner("220 smtp.example.com ESMTP", [{ contains: "ESMTP" }]);
     expect(result.matched).toBe(true);
   });
 
   test("contains 不匹配", () => {
-    const result = checkBanner("220 smtp.example.com ESMTP", { contains: "POSTFIX" });
+    const result = checkBanner("220 smtp.example.com ESMTP", [{ contains: "POSTFIX" }]);
     expect(result.matched).toBe(false);
     expect(result.failure!.kind).toBe("mismatch");
     expect(result.failure!.phase).toBe("banner");
   });
 
-  test("match 正则匹配", () => {
-    const result = checkBanner("220 smtp.example.com ESMTP", { match: "^220" });
+  test("regex 正则匹配", () => {
+    const result = checkBanner("220 smtp.example.com ESMTP", [{ regex: "^220" }]);
     expect(result.matched).toBe(true);
   });
 
   test("空 banner 与 contains 空字符串", () => {
-    const result = checkBanner("", { contains: "" });
+    const result = checkBanner("", [{ contains: "" }]);
     expect(result.matched).toBe(true);
   });
 
   test("多 operator 同时匹配", () => {
-    const result = checkBanner("220 ESMTP", { contains: "ESMTP", match: "^220" });
+    const result = checkBanner("220 ESMTP", [{ contains: "ESMTP", regex: "^220" }]);
     expect(result.matched).toBe(true);
   });
 
   test("多 operator 部分不匹配", () => {
-    const result = checkBanner("220 ESMTP", { contains: "ESMTP", match: "^250" });
+    const result = checkBanner("220 ESMTP", [{ contains: "ESMTP", regex: "^250" }]);
     expect(result.matched).toBe(false);
   });
 });