feat: add strictUrl control for miniapp launch URL

[Gaubee]

Summary

• add strictUrl?: boolean to miniapp manifest type and zod schema
• when strictUrl=true, keep launch URL unchanged (skip host __rv injection)
• keep existing behavior for default/false case
• document strictUrl in white-book manifest docs
• add unit tests for strict mode + existing context params

Validation

• pnpm vitest run src/services/miniapp-runtime/tests/launch-context.test.ts
• pnpm vitest run src/services/miniapp-runtime/tests/container.test.ts src/services/miniapp-runtime/tests/launch-context.test.ts
• pnpm exec oxlint src/services/ecosystem/types.ts src/services/ecosystem/schema.ts src/services/miniapp-runtime/launch-context.ts src/services/miniapp-runtime/tests/launch-context.test.ts