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

src/server/checker/runner/tcp/execute.ts

@@ -4,8 +4,8 @@ import type { CheckResult, RawTargetConfig } from "../../types";
 import type { CheckerContext, CheckerDefinition, CheckerValidationInput, ResolveContext } from "../types";
 import type { ResolvedTcpTarget, TcpExpectConfig, TcpTargetConfig } from "./types";
 
-import { checkDuration } from "../../expect/duration";
 import { errorFailure } from "../../expect/failure";
+import { checkValueMatcher } from "../../expect/matcher";
 import { parseSize } from "../../utils";
 import { checkBanner, checkConnected } from "./expect";
 import { tcpCheckerSchemas } from "./schema";
@@ -124,7 +124,11 @@ export class TcpChecker implements CheckerDefinition<ResolvedTcpTarget> {
       }
 
       const durationMs = Math.round(performance.now() - start);
-      const durationResult = checkDuration(durationMs, expect?.maxDurationMs);
+      const durationResult = checkValueMatcher(durationMs, expect?.durationMs, {
+        message: "durationMs mismatch",
+        path: "durationMs",
+        phase: "duration",
+      });
       if (!durationResult.matched) {
         return {
           durationMs,