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/framework-tests/platform/player-store.test.ts

@@ -0,0 +1,36 @@
+import { test } from 'node:test';
+import assert from 'node:assert/strict';
+import { PlayerStore } from '../../YouleNexus/assets/framework/platform/stores/player-store.ts';
+
+const RAW = { state: 0, playerid: 430511, nickname: '测试号', avatar: 'http://a', sex: 0,
+  bean: 0, roomcard: 3, score: 0, taskstate: 1, advanced: 0, bankpower: 1, bank: 0, bankpwd: 0,
+  ip: '127.0.0.1', sign: null, tel: null, invitecode: null, initCard: '3', initBean: '0',
+  openid: 'o1', unionid: 'u1', province: 'p', city: 'c' };
+
+test('applyLogin 填充 PlayerState 并通知订阅者', () => {
+  const store = new PlayerStore();
+  let notified = 0;
+  store.state.subscribe(() => { notified++; });
+  store.applyLogin(RAW as any);
+  const v = store.state.value;
+  assert.equal(v.playerid, 430511);
+  assert.equal(v.nickname, '测试号');
+  assert.equal(v.roomcard, 3);
+  assert.equal(v.taskstate, 1);
+  assert.equal(v.openid, 'o1');
+  assert.equal(v.initCard, '3');
+  assert.equal(notified, 1);
+});
+
+test('charm 等缺省字段补默认 0', () => {
+  const store = new PlayerStore();
+  store.applyLogin(RAW as any);
+  assert.equal(store.state.value.charm, 0);
+});
+
+test('未下发的可选字段(openid 等)缺省时不写入', () => {
+  const store = new PlayerStore();
+  store.applyLogin({ state: 0, playerid: 1 } as any);
+  assert.equal(store.state.value.openid, undefined);
+  assert.equal(store.state.value.playerid, 1);
+});