feat: admin UI overhaul with activity feed, payout manager, and Docker deployment

[gitteri]

Summary

• Complete redesign of the admin UI with improved styling and component architecture.
• New Activity Feed with real-time transaction monitoring via WebSocket and historical event loading from the indexer database.
• New Payout Manager component supporting CSV upload for batch payouts.
• Local storage persistence for form state (instance PDA, operator keypair, etc.) so values survive page reloads.
• Proxy configuration in Vite for routing read/write RPC calls through the dev server.
• Docker deployment support with Dockerfile and server.mjs Express server for production builds.

Changed files (23 files under admin-ui/)

• New: ActivityFeed.tsx, ActivityStats.tsx, PayoutManager.tsx, useActivityFeed.ts, useLocalStorage.ts, activity.ts, contraRpc.ts, csvParser.ts, Dockerfile, server.mjs
• Modified: App.tsx, App.css, AdminFunctions.tsx, ContraManagement.tsx, InstanceManager.tsx, MintManager.tsx, OperatorFunctions.tsx, StatusChecker.tsx, UserFunctions.tsx, vite.config.ts, .env.example, index.html, index.css

Dependencies

• Requires #4 feat/generated-ts-clients to be merged first (base branch).

Test plan

• pnpm dev starts without errors
• Activity feed populates with historical and real-time events
• Payout manager accepts CSV upload and parses correctly
• Form values persist across page reloads via local storage
• Docker build succeeds: docker build -t admin-ui ./admin-ui
• All existing admin functions (create instance, add operator, allow mint, deposit, release) still work

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