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/db/execute.test.ts

@@ -1,8 +1,15 @@
 import { describe, expect, test } from "bun:test";
 
-import type { ResolvedDbTarget } from "../../../../../src/server/checker/runner/db/types";
+import type {
+  RawDbExpectConfig,
+  ResolvedDbExpectConfig,
+  ResolvedDbTarget,
+} from "../../../../../src/server/checker/runner/db/types";
 import type { CheckerContext } from "../../../../../src/server/checker/runner/types";
 
+import { resolveContentExpectations } from "../../../../../src/server/checker/expect/content";
+import { resolveKeyedExpectations } from "../../../../../src/server/checker/expect/keyed";
+import { resolveValueExpectation } from "../../../../../src/server/checker/expect/value";
 import { DbChecker } from "../../../../../src/server/checker/runner/db/execute";
 
 const checker = new DbChecker();
@@ -13,20 +20,31 @@ function makeCtx(timeoutMs = 5000): CheckerContext {
   return { signal: controller.signal };
 }
 
-function makeTarget(db: Partial<ResolvedDbTarget["db"]>, overrides?: Partial<ResolvedDbTarget>): ResolvedDbTarget {
+function makeTarget(db: Partial<ResolvedDbTarget["db"]>, overrides?: { expect?: RawDbExpectConfig }): ResolvedDbTarget {
+  const raw = overrides?.expect;
+  const resolvedExpect: ResolvedDbExpectConfig | undefined = raw
+    ? {
+        durationMs: resolveValueExpectation(raw.durationMs),
+        result: resolveContentExpectations(raw.result),
+        rowCount: resolveValueExpectation(raw.rowCount),
+        rows: raw.rows?.map((row) => resolveKeyedExpectations(row) ?? []),
+      }
+    : undefined;
+
   return {
     db: {
       url: "sqlite://:memory:",
       ...db,
     },
     description: null,
+    expect: resolvedExpect,
     group: "default",
     id: "test-db",
     intervalMs: 60000,
     name: "test-db",
+    rawExpect: raw,
     timeoutMs: 5000,
     type: "db",
-    ...overrides,
   };
 }