feat(market): add hot-searches command for hot-search ranking

- Add `market hot-searches` CLI command for POST /v1/market/hot_searches
- Add getHotSearches() + HotSearchesParam/HotSearchesFilter to OpenApiClient
- Support --chain (repeatable), --interval, --limit, --filter, --params override
- Omitting --chain falls back to server default 7-chain config
- Validate --interval against 1m/5m/1h/6h/24h
- Sync SKILL.md, cli-usage.md, Readme.md, Readme.zh.md docs

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/client/OpenApiClient.ts

@@ -179,6 +179,18 @@ export interface TokenSignalGroup {
   max_create_or_open_ts?: string;
 }
 
+export interface HotSearchesFilter {
+  filters?: string[];
+  limit?: number;
+}
+
+export interface HotSearchesParam {
+  label?: string;
+  interval: string;       // "1m" | "5m" | "1h" | "6h" | "24h"
+  chain: string;          // "sol" | "bsc" | "base" | "eth" | "monad" | "megaeth" | "hyperevm" | "tron"
+  filter?: HotSearchesFilter;
+}
+
 export interface PumpFeeShareInfo {
   provider: string;       // "solana" | "twitter" | "github"
   username: string;       // platform username; a SOL address when provider = "solana"
@@ -430,6 +442,10 @@ export class OpenApiClient {
     return this.authExistRequest("POST", "/v1/market/token_signal", {}, { chain, groups });
   }
 
+  async getHotSearches(params: HotSearchesParam[]): Promise<unknown> {
+    return this.authExistRequest("POST", "/v1/market/hot_searches", {}, { params });
+  }
+
   // ---- User endpoints (exist auth) ----
 
   async getUserInfo(): Promise<unknown> {