feat(framework): platform PlayerStore(=C_Player) applyLogin

Implement PlayerStore wrapping signal<PlayerState> for player account data.
Adds applyLogin(raw) to fill state from login response A group, with:
- Mandatory fields get default 0/'' if missing (never undefined)
- Optional fields (openid/unionid/province/city) only set if present
- Immutable updates via spread operator
- Notifies subscribers on state change

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

cocoscreator_projects/YouleNexus/assets/framework/platform/stores/player-store.ts

@@ -0,0 +1,38 @@
+import { signal, type ReadonlyReactive } from '../../core/reactive.ts';
+import type { PlayerState } from './types.ts';
+import type { ReadonlyPlayerStore } from '../readonly.ts';
+import type { LoginResponseData } from '../../core/types/login.ts';
+
+const INITIAL: PlayerState = {
+  playerid: 0, nickname: '', avatar: '', sex: 0,
+  bean: 0, roomcard: 0, score: 0, charm: 0,
+  taskstate: 0, advanced: 0,
+  bankpower: 0, bank: 0, bankpwd: 0,
+  ip: '', sign: null, tel: null,
+  invitecode: null, initCard: 0, initBean: 0,
+};
+
+/** 玩家自身状态（= 旧 C_Player）。 */
+export class PlayerStore implements ReadonlyPlayerStore {
+  private s = signal<PlayerState>({ ...INITIAL });
+  get state(): ReadonlyReactive<PlayerState> { return this.s; }
+
+  /** 从 login 响应 A 组填充。字段名对齐 protocol/04（直接取服务器下发值）。 */
+  applyLogin(raw: LoginResponseData): void {
+    const r = raw as any;
+    this.s.value = {
+      ...this.s.value,
+      playerid: r.playerid ?? 0,
+      nickname: r.nickname ?? '', avatar: r.avatar ?? '', sex: r.sex ?? 0,
+      bean: r.bean ?? 0, roomcard: r.roomcard ?? 0, score: r.score ?? 0, charm: r.charm ?? 0,
+      taskstate: r.taskstate ?? 0, advanced: r.advanced ?? 0,
+      bankpower: r.bankpower ?? 0, bank: r.bank ?? 0, bankpwd: r.bankpwd ?? 0,
+      ip: r.ip ?? '', sign: r.sign ?? null, tel: r.tel ?? null,
+      invitecode: r.invitecode ?? null, initCard: r.initCard ?? 0, initBean: r.initBean ?? 0,
+      ...(r.openid != null ? { openid: String(r.openid) } : {}),
+      ...(r.unionid != null ? { unionid: r.unionid } : {}),
+      ...(r.province != null ? { province: String(r.province) } : {}),
+      ...(r.city != null ? { city: String(r.city) } : {}),
+    };
+  }
+}