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/store.test.ts

@@ -26,7 +26,7 @@ beforeAll(() => {
 
 const httpTarget: ResolvedHttpTarget = {
   description: null,
-  expect: { durationMs: { lte: 3000 }, status: [200] },
+  expect: { body: [{ kind: "value", matcher: { contains: "ok" } }], durationMs: { equals: 3000 }, status: [200] },
   group: "default",
   http: {
     headers: { Accept: "application/json" },
@@ -39,6 +39,7 @@ const httpTarget: ResolvedHttpTarget = {
   id: "test-http",
   intervalMs: 30000,
   name: "test-http",
+  rawExpect: { body: [{ contains: "ok" }], durationMs: 3000 },
   timeoutMs: 10000,
   type: "http",
 };
@@ -106,7 +107,7 @@ describe("ProbeStore", () => {
     expect(config.maxRedirects).toBe(0);
     expect(t.interval_ms).toBe(30000);
     expect(t.timeout_ms).toBe(10000);
-    expect(JSON.parse(t.expect!)).toEqual({ durationMs: { lte: 3000 }, status: [200] });
+    expect(JSON.parse(t.expect!)).toEqual({ body: [{ contains: "ok" }], durationMs: 3000 });
   });
 
   test("cmd target 字段正确", () => {