S3 setup

[spokonya]

Description

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Refactoring (code improvement without changing functionality)
• Documentation update
• Configuration/infrastructure change
• Performance improvement
• Test coverage improvement

Related Issue(s)

Related to #51

What Changed?

• Added S3 configuration (config/s3.go) with environment variable support for AWS credentials, region, and bucket name
  -Added S3 test handler
• Integrated S3 storage into app initialization and route setup (server.go)
• Made an s3 storage layer that initializes S3 client with credentials, generates time-limited upload URLs for direct client-to-S3 uploads, and allows for server-side file deletion from S3

Testing & Validation

How this was tested

1. started local server with s3 credentials configured
2. Created a call for a presigned URL
3. Used curl -X PUT with the presigned URL to upload a test file directly to s3
4. verified file appeared in my s3 dashboard

Screenshots/Recordings

Unfinished Work & Known Issues

• None, this PR is complete and production-ready
• The following items are intentionally deferred:
  • user profile picture endpoints
  • Frontend UI for uploads

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Notes & Nuances

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Pre-Merge Checklist

Code Quality

• Code follows the project's style guidelines and conventions
• Self-review completed (I've reviewed my own code for obvious issues)
• No debugging code, console logs, or commented-out code left behind
• No merge conflicts with the base branch
• Meaningful commit messages that explain the "why"

Testing & CI

• All CI checks are passing
• All new and existing tests pass locally
• Test coverage hasn't decreased (or decrease is justified)
• Linting passes without errors

Documentation

• Code is self-documenting or includes helpful comments for complex logic
• API documentation updated (if backend endpoints changed)
• Type definitions are accurate and up-to-date

Reviewer Notes

• Areas needing extra attention: ...
• Questions for reviewers: I need help with my .env variables. When I was testing I connected to local supabase but I couldn't get connecting to the remote server. It was either telling me that I was missing a required value (which I had) or that "Tenant or user not found"