feat: wallet UI — WalletConnect component + ranked fight flow in pages

Add WalletConnect.vue with NWC/LN Address connection states. Add "FIGHT
FOR SATS" button to JoinBoutPage with entry fee payment flow. Show ranked
pot and winner payout in FightPage. Add sats stats and wallet section to
BotProfilePage. Extend BotData interface with satsWon/satsWagered/hasWallet.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/composables/useNostr.ts

@@ -23,6 +23,9 @@ interface BotData {
   winStreak: number
   bestStreak: number
   tier: number
+  satsWon: number
+  satsWagered: number
+  hasWallet: boolean
 }
 
 interface NostrWindow {
@@ -140,6 +143,9 @@ export function useNostr() {
       winStreak: 0,
       bestStreak: 0,
       tier: 0,
+      satsWon: 0,
+      satsWagered: 0,
+      hasWallet: false,
     }
     store('bf_bot', bot.value)
 
@@ -201,6 +207,9 @@ export function useNostr() {
       winStreak: 0,
       bestStreak: 0,
       tier: 0,
+      satsWon: 0,
+      satsWagered: 0,
+      hasWallet: false,
     }
     store('bf_bot', bot.value)