feat: Add BlockRun AI models to frontend with no-API-key setup

[1bcMax]

🏆 Predict Developer Hackathon Submission

Track: Best Submission using x402 Protocol for automated tool discovery + payment

This PR integrates BlockRun's wallet-based AI model access into PredictOS, enabling developers to use 20+ AI models without API key management - powered by the x402 protocol.

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Summary

• Add 15 BlockRun AI models to the frontend UI dropdown in both AgenticMarketAnalysis and ArbitrageTerminal
• Update README with prominent "Quick Start with BlockRun" section highlighting wallet-based access
• No API keys required - users can access GPT-5, Claude Opus 4, Grok 3, Gemini 2.5, DeepSeek, and Qwen with just a wallet

What's New

Frontend Changes

• AgenticMarketAnalysis.tsx: Added 15 BlockRun models with cyan-themed UI styling
• ArbitrageTerminal.tsx: Same model additions for consistency
• Models are grouped under "BlockRun (No API Key)" section in dropdown

BlockRun Models Added

blockrun/gpt-4o, blockrun/gpt-4o-mini, blockrun/gpt-5, blockrun/o1
blockrun/claude-sonnet-4, blockrun/claude-opus-4, blockrun/claude-haiku
blockrun/grok-3, blockrun/grok-3-fast
blockrun/gemini-2.5-pro, blockrun/gemini-2.5-flash
blockrun/deepseek-chat, blockrun/deepseek-reasoner
blockrun/qwen-max, blockrun/qwen-plus

README Updates

• Added "Quick Start: Use BlockRun" section before the env example
• Added BLOCKRUN_WALLET_KEY to environment configuration
• Updated "Multi-Model Support" feature description

Why BlockRun + x402?

BlockRun leverages the x402 protocol for wallet-based AI model access:

• ✅ No API key signups - just connect your wallet
• ✅ Pay-per-request with USDC on Base
• ✅ Self-custody - your funds, your control
• ✅ 20+ models - GPT-5, Claude Opus 4, Grok 3, Gemini 2.5, DeepSeek, Qwen
• ✅ Automated payments via x402 protocol - no manual billing

Hackathon Alignment

Criteria	Implementation
x402 Protocol	BlockRun uses x402 for automated micropayments per AI request
Tool Discovery	Models auto-discovered and displayed in UI dropdown
Polymarket Integration	Works with PredictOS Super Intelligence for market analysis
Developer Experience	One env variable (BLOCKRUN_WALLET_KEY) to access 20+ models

Test Plan

• Run frontend with npm run dev in terminal directory
• Navigate to Market Analysis page
• Open model dropdown and verify BlockRun models appear
• Select a BlockRun model (e.g., blockrun/claude-opus-4)
• If BLOCKRUN_WALLET_KEY is configured, test running an analysis

Screenshots

BlockRun models now appear in the dropdown with cyan styling:

Models include GPT-4o, GPT-5, Claude Sonnet/Opus/Haiku, Grok 3, Gemini 2.5, DeepSeek, and Qwen variants.

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Submitted for the Predict Developer Hackathon

• Powered by @Polymarket, @getdomeapi, @privy_io, and x402 via @CoinBasedev tooling and @PayAINetwork