Use Zod for schemas and add TypeScript linting with ESLint

[sergeychernyshev]

Integrated Zod for data validation and ESLint for TypeScript linting.

Zod Integration

• Created modular schemas in src/schemas/ (account.ts, admin.ts, billing.ts, credential.ts, membership.ts, session.ts, user.ts).
• Refactored Durable Objects (UserDO, AccountDO, SystemDO, CredentialDO) to use these schemas.
• Enhanced Worker API handlers with strict Zod validation for all request.json() payloads.
• Fixed a bug in SystemDO.updateAccount where it incorrectly targeted the users table.

ESLint Integration

• Added ESLint with TypeScript support using a modern flat configuration (eslint.config.mjs).
• Configured rules for code quality (prefer-const, no-unused-vars with underscore ignore pattern).
• Cleaned up existing lint issues across the codebase (prefixed unused variables, fixed empty blocks).
• Added npm run lint and npm run lint:fix scripts.

Other Changes

• Ensured all TypeScript types are imported using import type.
• Verified all changes with the full test suite (51 tests passing).

Closes #74

✨ Assisted by AI: Gemini

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Status	Name	Latest Commit	Updated (UTC)
✅ Deployment successful! View logs	startup-api	c121abb	Feb 23 2026, 01:09 AM