feat(validation): export Zod as validation package

[LuanRoger]

This pull request adds support for validation utilities to both the server and client sides of the project. It introduces new entry points for validation, integrates the @hono/zod-validator and zod libraries, and updates configuration and dependency files to ensure proper type definitions and module resolutions.

Validation support integration:

• Added new entry points src/server/validation/index.ts and src/validation/index.ts to export and re-export validation utilities from @hono/zod-validator and zod, respectively. [1] [2]
• Updated tsdown.config.ts to include the new validation entry points for both server and client builds.

Dependency and configuration updates:

• Added @hono/zod-validator as a peer dependency and updated pnpm-lock.yaml to include its resolution and snapshot, ensuring compatibility with hono and zod. [1] [2] [3] [4]
• Updated package.json to add type definitions and module exports for the new validation entry points. [1] [2] [3]
• Minor reordering of the nodemon dependency in package.json for consistency.