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/config-loader.test.ts

@@ -824,7 +824,8 @@ targets:
         - json:
             path: "$.status"
             equals: "ok"
-      maxDurationMs: 3000
+      durationMs:
+        lte: 3000
 `,
     );
 
@@ -833,7 +834,7 @@ targets:
     if (t.type === "http") {
       expect(t.expect).toEqual({
         body: [{ contains: "ok" }, { json: { equals: "ok", path: "$.status" } }],
-        maxDurationMs: 3000,
+        durationMs: { lte: 3000 },
         status: [200, 201],
       });
     }
@@ -853,10 +854,11 @@ targets:
       exitCode: [0, 2]
       stdout:
         - contains: "ok"
-        - match: "done"
+        - regex: "done"
       stderr:
         - empty: true
-      maxDurationMs: 5000
+      durationMs:
+        lte: 5000
 `,
     );
 
@@ -864,10 +866,10 @@ targets:
     const t = config.targets[0]!;
     if (t.type === "cmd") {
       expect(t.expect).toEqual({
+        durationMs: { lte: 5000 },
         exitCode: [0, 2],
-        maxDurationMs: 5000,
         stderr: [{ empty: true }],
-        stdout: [{ contains: "ok" }, { match: "done" }],
+        stdout: [{ contains: "ok" }, { regex: "done" }],
       });
     }
   });
@@ -1074,7 +1076,7 @@ targets:
     await expect(loadConfig(configPath)).rejects.toThrow("5xx");
   });
 
-  test("expect.maxDurationMs 负数抛出错误", async () => {
+  test("expect.durationMs 非 matcher 抛出错误", async () => {
     const configPath = join(tempDir, "neg-duration.yaml");
     await writeFile(
       configPath,
@@ -1085,11 +1087,11 @@ targets:
     http:
       url: "http://example.com"
     expect:
-      maxDurationMs: -100
+      durationMs: -100
 `,
     );
     // eslint-disable-next-line @typescript-eslint/await-thenable
-    await expect(loadConfig(configPath)).rejects.toThrow("maxDurationMs 必须为非负有限数字");
+    await expect(loadConfig(configPath)).rejects.toThrow("expect.durationMs 必须为 matcher 对象");
   });
 
   test("expect.body 非数组抛出错误", async () => {
@@ -1126,7 +1128,7 @@ targets:
 `,
     );
     // eslint-disable-next-line @typescript-eslint/await-thenable
-    await expect(loadConfig(configPath)).rejects.toThrow("缺少支持的规则类型");
+    await expect(loadConfig(configPath)).rejects.toThrow("foo 是未知字段");
   });
 
   test("body rule 使用 match 字段（非支持）抛出错误", async () => {
@@ -1145,10 +1147,10 @@ targets:
 `,
     );
     // eslint-disable-next-line @typescript-eslint/await-thenable
-    await expect(loadConfig(configPath)).rejects.toThrow("缺少支持的规则类型");
+    await expect(loadConfig(configPath)).rejects.toThrow("match 是未知字段");
   });
 
-  test("body rule 多个支持字段抛出错误", async () => {
+  test("body rule 直接 matcher 混入 extractor 抛出错误", async () => {
     const configPath = join(tempDir, "bad-body-rule-multi.yaml");
     await writeFile(
       configPath,
@@ -1161,11 +1163,12 @@ targets:
     expect:
       body:
         - contains: "ok"
-          regex: "ok"
+          json:
+            path: "$.status"
 `,
     );
     // eslint-disable-next-line @typescript-eslint/await-thenable
-    await expect(loadConfig(configPath)).rejects.toThrow("只能配置一种规则类型");
+    await expect(loadConfig(configPath)).rejects.toThrow("直接 matcher 不能与 extractor 混用");
   });
 
   test("body regex 非法正则抛出错误", async () => {
@@ -1228,7 +1231,7 @@ targets:
     await expect(loadConfig(configPath)).rejects.toThrow("css.selector 必须为非空字符串");
   });
 
-  test("operator match 非法正则抛出错误", async () => {
+  test("旧 match matcher 抛出错误", async () => {
     const configPath = join(tempDir, "bad-op-match.yaml");
     await writeFile(
       configPath,
@@ -1245,7 +1248,7 @@ targets:
 `,
     );
     // eslint-disable-next-line @typescript-eslint/await-thenable
-    await expect(loadConfig(configPath)).rejects.toThrow("match 正则不合法");
+    await expect(loadConfig(configPath)).rejects.toThrow("match 是未知 matcher");
   });
 
   test("operator gte 非数字抛出错误", async () => {
@@ -1531,7 +1534,7 @@ targets:
       stdout:
         - {}
 `,
-      "stdout[0] 必须包含至少一个合法 operator",
+      "stdout[0] 必须包含至少一个合法 matcher",
     );
   });
 
@@ -1552,7 +1555,7 @@ targets:
     );
   });
 
-  test("cmd stdout match 正则非法", async () => {
+  test("cmd stdout 旧 match 字段非法", async () => {
     await expectConfigError(
       "bad-cmd-stdout-regex.yaml",
       `targets:
@@ -1565,7 +1568,7 @@ targets:
       stdout:
         - match: "[invalid"
 `,
-      "stdout[0].match 正则不合法",
+      "stdout[0].match 是未知字段",
     );
   });
 
@@ -1878,14 +1881,14 @@ targets:
       readBanner: true
     expect:
       banner:
-        contains: "ESMTP"
+        - contains: "ESMTP"
 `,
     );
 
     const config = await loadConfig(configPath);
     const t = config.targets[0]! as ResolvedTcpTarget;
     expect(t.tcp.readBanner).toBe(true);
-    expect(t.expect?.banner).toEqual({ contains: "ESMTP" });
+    expect(t.expect?.banner).toEqual([{ contains: "ESMTP" }]);
   });
 
   test("tcp expect.banner 未开启 readBanner 抛出错误", async () => {
@@ -1954,7 +1957,7 @@ targets:
     );
   });
 
-  test("tcp expect connected 和 maxDurationMs", async () => {
+  test("tcp expect connected 和 durationMs", async () => {
     const configPath = join(tempDir, "tcp-expect-connected.yaml");
     await writeFile(
       configPath,
@@ -1966,14 +1969,15 @@ targets:
       port: 80
     expect:
       connected: false
-      maxDurationMs: 5000
+      durationMs:
+        lte: 5000
 `,
     );
 
     const config = await loadConfig(configPath);
     const t = config.targets[0]! as ResolvedTcpTarget;
     expect(t.expect?.connected).toBe(false);
-    expect(t.expect?.maxDurationMs).toBe(5000);
+    expect(t.expect?.durationMs).toEqual({ lte: 5000 });
   });
 
   test("解析最简 ping 配置", async () => {
@@ -2011,10 +2015,14 @@ targets:
       packetSize: 1472
     expect:
       alive: true
-      maxPacketLoss: 10
-      maxAvgLatencyMs: 200
-      maxMaxLatencyMs: 500
-      maxDurationMs: 5000
+      packetLossPercent:
+        lte: 10
+      avgLatencyMs:
+        lte: 200
+      maxLatencyMs:
+        lte: 500
+      durationMs:
+        lte: 5000
 `,
     );
 
@@ -2023,10 +2031,10 @@ targets:
     expect(t.ping).toEqual({ count: 5, host: "10.0.0.1", packetSize: 1472 });
     expect(t.expect).toEqual({
       alive: true,
-      maxAvgLatencyMs: 200,
-      maxDurationMs: 5000,
-      maxMaxLatencyMs: 500,
-      maxPacketLoss: 10,
+      avgLatencyMs: { lte: 200 },
+      durationMs: { lte: 5000 },
+      maxLatencyMs: { lte: 500 },
+      packetLossPercent: { lte: 10 },
     });
   });