docs: add missing JWT_REFRESH_SECRET to backend environment variables reference table

[Mohit-001-hash]

What Changed

• Updated the local setup instructions in README.md to include the --build flag for the docker-compose up command.
• Added a brief note explaining why building is necessary when modifying .env files for the first time.

Why

• Previously, the instructions simply said to run docker-compose up. If a new contributor modified their environment variables during the initial setup, those changes wouldn't be reflected in the container, leading to confusing connection errors and wasted debugging time. This ensures a smooth onboarding experience.

How To Test

• Read the updated "Docker Setup" section in the README.md.
• Verify the command docker-compose up -d --build is clearly documented.

Screenshots

None

Related Issue

Closes #None

Checklist

• I have read CONTRIBUTING.md.
• I kept this pull request focused on one issue.
• I ran the relevant checks locally.
• I added or updated tests where appropriate.
• I added screenshots or screen recordings for UI changes.
• I documented any known limitations or follow-up work.

Notes

None

Summary by CodeRabbit

• Documentation
  • Updated backend environment variables documentation to include JWT refresh secret configuration reference.

[vercel]

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 11204b41-665c-4a25-a793-e71835594135

📥 Commits

Reviewing files that changed from the base of the PR and between f2501a5 and 5b04dbd.

📒 Files selected for processing (1)

• README.md

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📝 Walkthrough

Walkthrough

A single row documenting JWT_REFRESH_SECRET (example value: your_refresh_secret) was added to the Backend (.env) environment variables table in README.md.

Changes

README Documentation Update

Layer / File(s)	Summary
Add JWT_REFRESH_SECRET to env vars table README.md	Inserts a new row for JWT_REFRESH_SECRET with its example value into the Backend (.env) environment variables table.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~1 minute

Poem

A secret for tokens, now listed with care,
The refresh key hidden no longer — it's there!
One row in a table, a small fluffy hop,
The docs are now whole, right up to the top.
🐇✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'docs: add missing JWT_REFRESH_SECRET to backend environment variables reference table' directly matches the raw summary which confirms adding JWT_REFRESH_SECRET to the backend environment variables table in README.md.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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