refactor: expect 类型模型重构，Raw/Resolved 双层分离与断言基础设施内聚

- 重命名 ContentRules→ContentExpectations, KeyValueExpect→KeyedExpectations
- 新增 Raw/Resolved 双层模型：resolve 阶段物化为执行计划，store 持久化 Raw 快照
- HTTP body 按需读取：status/headers 失败或无 body expectation 时不读取 body
- 新增 displayValueExpectation() 解包 failure.expected 用户可读展示
- 修复 checkEarlyTimeout 独立 lte/lt 检查，修复 KeyedExpectations JSON Schema
- 新增 expect/value.ts(resolve/check/display)、keyed.ts、content.ts、headers.ts、status.ts
- 删除旧 normalize.ts/matcher.ts/validate-matcher.ts/key-value.ts
- 更新 DEVELOPMENT.md：expect 五层管线表、displayValueExpectation、1.7↔1.10 交叉引用
- 同步 13 个 main specs，归档 refactor-expect-type-model 变更（62/62 tasks）

tests/server/checker/runner/udp/expect.test.ts

@@ -1,5 +1,7 @@
 import { describe, expect, it } from "bun:test";
 
+import type { ContentExpectations } from "../../../../../src/server/checker/expect/types";
+
 import {
   checkResponded,
   checkResponseSize,
@@ -8,6 +10,10 @@ import {
   checkSourcePort,
 } from "../../../../../src/server/checker/runner/udp/expect";
 
+function value(matcher: ContentExpectations[number]["matcher"]): ContentExpectations[number] {
+  return { kind: "value", matcher };
+}
+
 describe("checkResponded", () => {
   it("responded=true 期望 true → 匹配", () => {
     const result = checkResponded(true, true);
@@ -63,26 +69,26 @@ describe("checkResponseSize", () => {
 
 describe("checkResponseText", () => {
   it("单条 contains 匹配", () => {
-    const result = checkResponseText("PONG", [{ contains: "PONG" }]);
+    const result = checkResponseText("PONG", [value({ contains: "PONG" })]);
     expect(result.matched).toBe(true);
     expect(result.failure).toBeNull();
   });
 
   it("单条 contains 不匹配，phase=response", () => {
-    const result = checkResponseText("PING", [{ contains: "PONG" }]);
+    const result = checkResponseText("PING", [value({ contains: "PONG" })]);
     expect(result.matched).toBe(false);
     expect(result.failure!.kind).toBe("mismatch");
     expect(result.failure!.phase).toBe("response");
   });
 
   it("多条规则全部匹配", () => {
-    const result = checkResponseText("hello world", [{ contains: "hello" }, { regex: "^hello" }]);
+    const result = checkResponseText("hello world", [value({ contains: "hello" }), value({ regex: "^hello" })]);
     expect(result.matched).toBe(true);
     expect(result.failure).toBeNull();
   });
 
   it("多条规则第二条失败 → 不匹配", () => {
-    const result = checkResponseText("hello world", [{ contains: "hello" }, { regex: "^world" }]);
+    const result = checkResponseText("hello world", [value({ contains: "hello" }), value({ regex: "^world" })]);
     expect(result.matched).toBe(false);
     expect(result.failure!.phase).toBe("response");
     expect(result.failure!.path).toBe("response[1]");