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/validate.ts

@@ -3,7 +3,7 @@ import { isNumber, isPlainObject, isString } from "es-toolkit";
 import type { ConfigValidationIssue } from "../../schema/issues";
 import type { CheckerValidationInput } from "../types";
 
-import { validateOperatorObject } from "../../expect/validate-operator";
+import { validateContentRules, validateValueMatcher } from "../../expect/validate-matcher";
 import { issue, joinPath } from "../../schema/issues";
 
 export function validateTcpConfig(input: CheckerValidationInput): ConfigValidationIssue[] {
@@ -79,8 +79,8 @@ function validateTcpExpect(
     issues.push(issue("invalid-type", joinPath(expectPath, "connected"), "必须为布尔值", targetName));
   }
 
-  if (expect["maxDurationMs"] !== undefined && !isNonNegativeFiniteNumber(expect["maxDurationMs"])) {
-    issues.push(issue("invalid-type", joinPath(expectPath, "maxDurationMs"), "必须为非负有限数字", targetName));
+  if (expect["durationMs"] !== undefined) {
+    issues.push(...validateValueMatcher(expect["durationMs"], joinPath(expectPath, "durationMs"), targetName));
   }
 
   if (expect["banner"] !== undefined) {
@@ -89,11 +89,11 @@ function validateTcpExpect(
         issue("invalid-value", joinPath(expectPath, "banner"), "banner 断言需要启用 tcp.readBanner", targetName),
       );
     } else {
-      issues.push(...validateOperatorObject(expect["banner"], joinPath(expectPath, "banner"), targetName));
+      issues.push(...validateContentRules(expect["banner"], joinPath(expectPath, "banner"), targetName));
     }
   }
 
-  const allowedKeys = new Set(["banner", "connected", "maxDurationMs"]);
+  const allowedKeys = new Set(["banner", "connected", "durationMs"]);
   for (const key of Object.keys(expect)) {
     if (!allowedKeys.has(key)) {
       issues.push(issue("unknown-field", joinPath(expectPath, key), "是未知字段", targetName));