refactor: 重构为单向生成架构，CLI 零参数可用

- 迁移 examples/rules/ 到 src/rules/，resources/devices.json 到 src/devices.json
- 迁移 resources/fetch-devlist.js 到 src/tools/fetch-devlist.ts 并改造为 ESM
- CLI 简化为零参数：bun run pack 自动编译并输出 dist/miot_{timestamp}.bak
- 移除备份合并能力：删除 mergeCompiledRules、RuleReplaceStrategy、dry-run、replace 参数
- 编译器简化为从零生成，不再支持 baseBackup 合并
- 新增 fetch-devices 命令用于从中枢网关更新设备清单
- 新增 bn.js、elliptic 依赖
- 更新测试路径引用，移除依赖合并逻辑的测试用例
- 更新 README.md 反映新项目结构和命令

tests/compiler.test.ts

@@ -1,10 +1,10 @@
 import { describe, expect, test } from "bun:test";
-import { readDeviceInventoryFile, readBackupFile } from "../src/index.ts";
+import { readBackupFile } from "../src/index.ts";
 import { collectRuleDefinitions, compileRule, compileWorkflow } from "../src/compiler.ts";
-import examples, { conditionBeforeAction, eventTurnOn, mergedTriggers } from "../examples/rules/index.ts";
+import examples, { conditionBeforeAction, eventTurnOn, mergedTriggers } from "../src/rules/index.ts";
 
 const now = 1_760_000_000_000;
-const devices = readDeviceInventoryFile("resources/devices.json");
+const devices = (await import("../src/devices.json")).default;
 
 describe("规则编译", () => {
   test("单条事件触发开灯规则生成稳定 JSON", () => {
@@ -79,16 +79,8 @@ describe("规则编译", () => {
   });
 
   test("模块导出收集支持默认数组和命名规则", async () => {
-    const moduleExports = await import("../examples/rules/index.ts");
+    const moduleExports = await import("../src/rules/index.ts");
     const definitions = collectRuleDefinitions(moduleExports);
     expect(definitions.map((definition) => definition.name)).toEqual(examples.map((definition) => definition.name));
   });
-
-  test("编译并追加到真实备份时保留原有规则", () => {
-    const base = readBackupFile("resources/备份2026_4_26 19_17_42.bak");
-    const result = compileWorkflow([eventTurnOn], base, { now, devices });
-    expect(result.diagnostics.filter((diagnostic) => diagnostic.severity === "error")).toEqual([]);
-    expect(result.backup.rules).toHaveLength(base.rules.length + 1);
-    expect(result.backup.rules.at(-1)?.cfg.userData.name).toBe("示例-事件触发开灯");
-  });
 });