Switch to zod based JSON schema for config

[rithviknishad]

Switch to zod based JSON schema for validating the config.

References:

• https://github.com/ohcnetwork/leaderboard/blob/main/config.schema.json
• https://github.com/ohcnetwork/leaderboard/blob/main/lib/config.ts
• https://github.com/ohcnetwork/leaderboard/blob/main/types/config.ts
• https://zod.dev/json-schema

[amanpandey2587]

Hi @rithviknishad
I'd like to work on this issue. I have experience with Zod and TypeScript schema validation.
My approach would be:
Install zod and zod-to-json-schema dependencies
Create a Zod schema in config.schema.ts based on the existing JSON schema structure (following the leaderboard repo reference)
Update config.ts to use Zod's .parse() method for validation
Generate TypeScript types using z.infer in types/config.ts
Optionally generate JSON schema from Zod using zodToJsonSchema() for backward compatibility if needed
Update any related tests
Benefits of this migration:
Please assign this issue to me.
Thanks