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/db/expect.test.ts

@@ -4,35 +4,35 @@ import { checkRowCount, checkRows } from "../../../../../src/server/checker/runn
 
 describe("checkRowCount", () => {
   test("空数组通过 rowCount gte 0", () => {
-    const result = checkRowCount([], { gte: 0 });
+    const result = checkRowCount(0, { gte: 0 });
     expect(result.matched).toBe(true);
     expect(result.failure).toBeNull();
   });
 
-  test("非数组视为 0 行", () => {
-    const result = checkRowCount(null, { gte: 0 });
+  test("0 行通过 gte 0", () => {
+    const result = checkRowCount(0, { gte: 0 });
     expect(result.matched).toBe(true);
   });
 
   test("rowCount gte 通过", () => {
-    const result = checkRowCount([1, 2, 3], { gte: 3 });
+    const result = checkRowCount(3, { gte: 3 });
     expect(result.matched).toBe(true);
   });
 
   test("rowCount gte 失败", () => {
-    const result = checkRowCount([1, 2], { gte: 3 });
+    const result = checkRowCount(2, { gte: 3 });
     expect(result.matched).toBe(false);
     expect(result.failure!.phase).toBe("rowCount");
     expect(result.failure!.path).toBe("rowCount");
   });
 
   test("rowCount equals 通过", () => {
-    const result = checkRowCount([1, 2, 3], { equals: 3 });
+    const result = checkRowCount(3, { equals: 3 });
     expect(result.matched).toBe(true);
   });
 
   test("rowCount equals 失败", () => {
-    const result = checkRowCount([1, 2, 3], { equals: 5 });
+    const result = checkRowCount(3, { equals: 5 });
     expect(result.matched).toBe(false);
   });
 });
@@ -117,8 +117,8 @@ describe("checkRows", () => {
     expect(result.matched).toBe(true);
   });
 
-  test("match 正则匹配", () => {
-    const result = checkRows([{ code: "ABC-123" }], [{ code: { match: "^ABC-" } }]);
+  test("regex 正则匹配", () => {
+    const result = checkRows([{ code: "ABC-123" }], [{ code: { regex: "^ABC-" } }]);
     expect(result.matched).toBe(true);
   });