feat: implemented discord bot

[barrymichaeldoyle]

What

This implements the discord bot 🚀

You can install it to your server here: https://grand-yak-92.convex.site/discord/install

Closes #6

[coderabbitai]

Caution

Review failed

Pull request was closed or merged during review

Walkthrough

This pull request introduces Discord Bot support to the Patch Pulse platform. New documentation pages describe Discord features, slash commands, and installation steps. A new Astro component (AddToDiscordButton) provides Discord install functionality. Backend changes add Discord API interaction handling, slash command processing (npmtrack, npmuntrack, npmlist), OAuth installation flow, and request signature verification. The database schema is extended with a discordSubscriberDetails table for Discord guild metadata. The polling system is updated to format and send notifications to Discord channels. Environment variables for Discord credentials are added, and HTTP endpoints handle Discord OAuth redirects, slash command interactions, and global command registration.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 4.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'feat: implemented discord bot' clearly and concisely summarizes the main change—implementing Discord bot functionality.
Description check	✅ Passed	The description relates to the changeset by stating the Discord bot implementation and providing an install link, matching the PR's core objective.
Linked Issues check	✅ Passed	The PR implements all core requirements from issue #6: slash commands (/npmtrack, /npmuntrack, /npmlist), automatic notifications, typed slash-command options, and no default channel requirement.
Out of Scope Changes check	✅ Passed	All changes are directly tied to Discord bot implementation: new Discord API/command handlers, schema extensions, documentation, and environment variables. No unrelated changes detected.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/discord-bot

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