refactor: Simplify useMarket composable by removing unused client references and improving parameter naming

- Eliminate unnecessary Nostr client retrieval in publishProduct and publishStall functions.
- Update parameter names in event processing functions for clarity, using underscores for unused parameters.
- Clean up imports in useMarket.ts to streamline the codebase.

src/stores/market.ts

@@ -1,6 +1,6 @@
 import { defineStore } from 'pinia'
 import { ref, computed, readonly } from 'vue'
-import { config } from '@/lib/config'
+
 
 // Types
 export interface Market {