feat(framework): protocol routes 常量 + login 请求构造/响应解析

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

cocoscreator_projects/YouleNexus/assets/framework/protocol/login.ts

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+import type { LoginRequestData, LoginResponseData } from '../core/types/login.ts';
+
+/** 构造 player_login 请求 data。字段以 docs/protocol/01 §6、02 为准。 */
+export function buildLoginRequest(identity: LoginRequestData): LoginRequestData {
+  return { ...identity };
+}
+
+export interface ParsedLogin {
+  ok: boolean;            // state===0
+  playerid: number;
+  inRoom: boolean;        // 含 roomcode → 需恢复房间
+  hasBattle: boolean;     // isbattle===1 或含 deskinfo → 需重连对局
+  deskinfo: unknown;      // 子游戏对局快照（原样透传，见 docs/protocol/05）
+  raw: LoginResponseData;
+}
+
+/** 解析 player_login 响应（最小集）。完整字段见 docs/protocol/04。 */
+export function parseLoginResponse(data: LoginResponseData): ParsedLogin {
+  const roomcode = (data as any).roomcode;
+  const deskinfo = (data as any).deskinfo;
+  return {
+    ok: data.state === 0,
+    playerid: data.playerid,
+    inRoom: roomcode != null && roomcode !== '',
+    hasBattle: (data as any).isbattle === 1 || deskinfo != null,
+    deskinfo,
+    raw: data,
+  };
+}

cocoscreator_projects/YouleNexus/assets/framework/protocol/routes.ts

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+import { Route } from '../core/constants.ts';
+export { Route };
+/** 平台层会用到的 rpc 名（最小集）。完整清单见 docs/protocol/02、03。 */
+export const Rpc = {
+  player_login: 'player_login',
+  kick_server: 'kick_server',
+  connect_roomserver: 'connect_roomserver',
+  connect_agentserver: 'connect_agentserver',
+} as const;