feat(wasm): align LLM and route types with platform-v2 SDK

[echobt]

Summary

Replace local duplicate type definitions in term-challenge-wasm with re-exports from platform_challenge_sdk_wasm to ensure type consistency across the platform stack.

Changes

wasm/src/types.rs

• Remove local LlmMessage, LlmRequest (had temperature: f64), and LlmResponse struct definitions
• Remove local RouteDefinition struct (missing requires_auth field)
• Remove local WasmRouteRequest struct (missing params/query fields)
• Add re-exports from SDK: LlmMessage, LlmRequest (temperature: f32), LlmResponse
• Add re-exports from SDK: WasmRouteDefinition, WasmRouteRequest

wasm/src/routes.rs

• Update import from RouteDefinition to WasmRouteDefinition
• Update get_route_definitions() return type to Vec<WasmRouteDefinition>
• Update all 27 route definitions with requires_auth field (GET routes = false, auth-required POST routes = true)

Key decisions

• LlmUsage not re-exported since it is unused in term-challenge (avoids unused import warning)
• temperature: 0.1 literal in llm_review.rs correctly infers as f32 — no change needed
• /submit POST route marked requires_auth: true since it processes authenticated submissions

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/align-types-with-sdk

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