refactor(game): 重构项目结构,优化链路, 移动端适配

- 移除 useGameBoardVm 数据层实施说明文档
- 移除核心玩法与前端规则摘要文档
- 移除游戏模块数据与界面分层第一阶段实施稿文档
- 清理与数据层重构相关的技术方案说明
- 删除关于 PC 和 Mobile 界面分离的设计规划
- 移除 view-model hooks 架构设计相关内容

src/modal/mobile/mobile-support-modal.tsx

@@ -0,0 +1,78 @@
+import { useCallback, useEffect, useRef, useState } from 'react'
+import { MobileCenterModal } from '@/components/mobile-center-modal.tsx'
+import { DataLoadingIndicator } from '@/components/ui/data-loading-indicator'
+import { useModalStore } from '@/store'
+
+const SUPPORT_CHAT_URL =
+  'https://tawk.to/chat/6a1d23d9e29f411c2ce86772/1jq0t82lu'
+const IFRAME_READY_DELAY_MS = 2_000
+
+function MobileSupportModal() {
+  const [isLoading, setIsLoading] = useState(true)
+  const readyTimerRef = useRef<number | null>(null)
+  const open = useModalStore((state) => state.modals.desktopSupport)
+  const setModalOpen = useModalStore((state) => state.setModalOpen)
+
+  const clearReadyTimer = useCallback(() => {
+    if (readyTimerRef.current === null) {
+      return
+    }
+
+    window.clearTimeout(readyTimerRef.current)
+    readyTimerRef.current = null
+  }, [])
+
+  const handleClose = () => {
+    setModalOpen('desktopSupport', false)
+  }
+
+  const handleLoaded = () => {
+    clearReadyTimer()
+    readyTimerRef.current = window.setTimeout(() => {
+      setIsLoading(false)
+      readyTimerRef.current = null
+    }, IFRAME_READY_DELAY_MS)
+  }
+
+  useEffect(() => {
+    if (open) {
+      clearReadyTimer()
+      setIsLoading(true)
+    }
+
+    return clearReadyTimer
+  }, [clearReadyTimer, open])
+
+  return (
+    <MobileCenterModal
+      open={open}
+      isNormalBg={true}
+      onClose={handleClose}
+      titleAlign="left"
+      title={<div className="modal-title-glow text-design-16">在线客服</div>}
+      className="h-design-500"
+    >
+      <div className="h-full min-h-0 px-design-8 pb-design-10 pt-design-4">
+        <div className="relative h-full min-h-0 overflow-hidden rounded-[calc(var(--design-unit)*7)] border border-[#2A6D73] bg-[linear-gradient(180deg,rgba(5,22,31,0.98),rgba(2,10,17,0.98))] shadow-[inset_0_0_calc(var(--design-unit)*14)_rgba(88,205,218,0.13),0_0_calc(var(--design-unit)*10)_rgba(31,156,174,0.14)]">
+          {isLoading ? (
+            <div className="absolute inset-0 z-10 flex items-center justify-center bg-[radial-gradient(circle_at_center,rgba(20,92,105,0.38),rgba(2,10,17,0.98)_58%)]">
+              <DataLoadingIndicator
+                label="客服连线中"
+                className="text-design-12"
+              />
+            </div>
+          ) : null}
+          <iframe
+            title="customer-service-chat"
+            src={SUPPORT_CHAT_URL}
+            onLoad={handleLoaded}
+            className="h-full w-full bg-[linear-gradient(180deg,#061923,#020A11)]"
+            allow="microphone; camera; clipboard-read; clipboard-write"
+          />
+        </div>
+      </div>
+    </MobileCenterModal>
+  )
+}
+
+export default MobileSupportModal