fix(gen): preserve fromTypes compiler defaults

[lxy2500798479]

Summary

• preserve declaration compiler defaults when fromTypes(..., { compilerOptions }) is used
• set the generated tsconfig rootDir to the project root and keep declaration output inside tmpRoot/dist
• add regression coverage for a partial compilerOptions override

Why

compilerOptions previously replaced the whole generated block. Passing an override such as { strict: true } dropped required declaration emit settings like declaration, emitDeclarationOnly, noEmit: false, and outDir. With newer TypeScript behavior, missing rootDir/outDir can also let generated .d.ts files appear beside project sources instead of staying in the temporary directory.

Tests

• PATH="$PWD/node_modules/.bin:$PATH" bun test test/gen/index.test.ts --timeout 20000
• git diff --check
• bun run build
• PATH="$PWD/node_modules/.bin:$PATH" bun run test

Closes elysiajs/elysia#1855

[coderabbitai]

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