Initial commit: @b2c/first_page HarmonyOS stage-mode HAR

## Repository
- HarmonyOS stage-mode HAR module, consumed by host app
- No standalone build — hvigorw, oh_modules, and ../biz_quote absent here

## Architecture
### Feed Cards
- FirstPage.createNodeView dispatches cards by FirstPageConstant.KEY_*
- Card config from first_page_cards_config.json loaded by FirstPageCardsConfigLoader
- Public entrypoint: Index.ets

### Market Ranking (src/main/ets/market-ranking/)
- HTTP: MarketRankingDataFetcher fetches recommend_futures contracts
- HQ: MarketRankingHqRequestClient subscribes via 4106/frame 2201/scenario qht_qihuo_sort
- TCP reconnect rebuilds subscription from original HTTP contract list
- Async callbacks guarded by request/subscription versions

### Other Cards
- HotList, CommodityOptions, AiDiagnosis, AiRiseFall, SelfSelectedStock, CustomEntryList, FourEntryList
- Each has DataFetcher + HQ request client + NodeComponent

## Key Changes (from CardHarmonyOS reference)
- Added MetricId, PeriodId, SortOrder enums (MarketRankingModels.ets)
- Replaced string comparisons with enum switches in thirdColumnTitle/Value/Color
- Removed redundant undefined guards in thirdColumnColor/priceColor, delegated to riseFallColor
- Inlined priceColor(), use riseFallColor directly
- Tab bar Stack.height(30), Alignment.End (reverted from 46/TopEnd)
- Name column fontWeight removed (default regular)

src/main/ets/constants/FirstPageConstants.ets

@@ -0,0 +1,96 @@
+/**
+ *  author : liuqingliang@myhexin.com
+ *  time   : created on 2026/6/2
+ *  desc   : 首页模块公共常量
+ */
+
+// cbas相关
+export const CBAS_SPLIT_DIAN = "."
+
+export const CBAS_SERVE_PAGE_ROBOT = "robot"
+
+export const CBAS_PREFIX_SHOUYE = "newshouye"
+
+export const CBAS_FIRST_PAGE_TOP_FUNCT = "topFunc"
+
+export const CBAS_FIRST_PAGE_TOP_BANNER = "topBanner"
+
+export const CBAS_FIRST_PAGE_USER_CENTER = "userCenter"
+
+export const CBAS_FIRST_PAGE_BOTTOM_FUNCT = "bottom"
+
+export const WEB_RESOURCES_ID = "free_per_login"
+
+export const CBAS_FIRST_PAGE_NOT_LOGIN = "weidenglu"
+
+export const CBAS_FIRST_PAGE_MESSAGE = "message"
+
+export const CBAS_SEARCH = "search"
+
+export const CBAS_SHOW = "show"
+
+export const CBAS_CLICK = "click"
+
+export const CBAS_BOTTOM_MANAGE = "pageManage"
+
+export const CBAS_BOTTOM_FEED_BACK = "feedback"
+
+/**
+ * 首页运营广告 CBAS 前缀
+ */
+export const CBAS_FIRST_PAGE_PREFIX = "newshouye"
+
+/**
+ * 广告 CBAS object 前缀
+ */
+export const CBAS_OBJECT_PREFIX_AD = "ad"
+
+/**
+ * Banner 点击 CBAS 数字部分（无点号后缀），配合 sendStandardJumpPageCbas 使用
+ */
+export const CBAS_CLICK_BANNER_NO_DOT = "1"
+
+/**
+ * WebView 页面 frameId，对齐 Android FRAME_ID_COMMON_BROWSER
+ */
+export const FRAME_ID_COMMON_BROWSER = "web"
+
+/**
+ * 点击操作
+ */
+export const AD_CLICK_TYPE_INVALIDE: number = -1
+
+export const ACTION_OPERATE_TYPE_CLICK = 1
+
+export const AD_TYPE_INVALID = ""
+
+export const AD_CLICK_TYPE_UNINTEREST = 0
+
+export const AD_CLICK_TYPE_INTEREST = 1
+
+// 广告操作类型
+/***广告显示 */
+export const AD_OPERATION_SHOW = 1
+
+/***广告点击 */
+export const AD_OPERATION_CLICK = 2
+
+/***广告请求错误 */
+export const AD_OPERATION_ERROR = 3
+
+/*** 广告手动轮播 */
+export const AD_OPERATION_SWITCH = 4
+
+/*** 广告自动轮播 */
+export const AD_OPERATION_AUTO = 5
+
+/*** 首页运营广告 */
+export const AD_LOCATION_YUNYING_SHOUYE = "indexFeedYunYing"
+
+export const CBAS_FIRSTPAGE_PREFIX = '_tanchuangad.%s.'
+
+export const CBAS_FIRSTPAGE_TANGCHUANGAD_BAOGUANG = 'baoguang.ad%s'
+
+export const CBAS_FIRSTPAGE_TANGCHUANGAD_CLOSE = 'close.ad%s'
+
+export const CBAS_FIRSTPAGE_TANGCHUANGAD_DIANJI = "_tanchuangad.dianji.ad%s"; //弹窗广告

src/main/ets/constants/FirstPageFiveCBASConstants.ets

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+/**
+ *  author : liuqingliang@myhexin.com
+ *  time   : created on 2026/6/12
+ *  desc   : 首页五段式埋点常量
+ */
+
+export class FirstPageFiveCBASConstants {
+  static CBAS_BANNER_LOGMAP_ADID = 'adId'
+  // ========== OID常量 ==========
+  static CBAS_SHOUYE_BANNER = 'qht_qhtshouye_Banner_banner'
+  static CBAS_ADS_POPUP = 'qht_xuanfuqiu_fuchuang_FloatingWindow'
+}