feat: add Claude Code review workflows and CLAUDE.md documentation

[henrypark133]

The Claude Code Workflow won't work for this PR. We will need to wait until this PR is merged to test it.

Warning: Skipping action due to workflow validation: Workflow validation failed. The workflow file must exist and have identical content to the version on the repository's default branch. If you're seeing this on a PR when you first add a code review workflow file to your repository, this is normal and you should ignore this error.

[gemini-code-assist]

Summary of Changes

Hello @henrypark133, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request integrates a dedicated "CLAUDE.md" document to guide Claude Code on interacting with the repository, with a strong focus on privacy, data security, and logging protocols. It also provides a thorough project overview and development instructions, alongside an update to the ".gitignore" file to manage markdown documentation effectively.

Highlights

• Claude Code Documentation: Introduces a new "CLAUDE.md" file providing comprehensive guidelines for Claude Code, emphasizing privacy, data security, and logging best practices.
• Project Overview and Development Guide: The "CLAUDE.md" file also includes a detailed project overview, build/development commands, Docker setup, architecture, and testing notes for the repository.
• Gitignore Update: Modifies ".gitignore" to include ".env.*" and to specifically ignore all markdown files except "CLAUDE.md" and "README.md", ensuring relevant documentation is tracked.

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Ignored Files

• Ignored by pattern: .github/workflows/** (2)
  • .github/workflows/claude-code-review.yml
  • .github/workflows/claude.yml

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[gemini-code-assist]

Code Review

This pull request introduces a CLAUDE.md file to provide context and guidelines for AI-assisted code review, and updates the .gitignore file. The CLAUDE.md is comprehensive and well-structured, with a strong emphasis on data privacy and security, which is excellent. The changes to .gitignore are also appropriate. My review includes a couple of minor suggestions to enhance the clarity and completeness of the development instructions in CLAUDE.md.

[gemini-code-assist]

This section is very helpful for running the application locally. To make it even more self-contained, consider adding a quick-start command for setting up the required PostgreSQL database using Docker. This would lower the barrier for new contributors to get the project running.

Suggested change

	# Run locally (requires PostgreSQL and .env file)
	# Run locally (requires PostgreSQL and .env file)
	# Example to run PostgreSQL with Docker: docker run --name chat-api-db -e POSTGRES_PASSWORD=postgres -e POSTGRES_DB=chat_api -p 5432:5432 -d postgres

[gemini-code-assist]

The comment for this test command could be more precise. Since the E2E tests are ignored by default, this command runs all unit and integration tests. Clarifying this will help developers (and AI) understand exactly which tests are being executed.

Suggested change

	cargo test --features test # All tests with mock-login endpoint
	cargo test --features test # Run unit & integration tests (excludes ignored E2E tests)