Added category exclusion filters for LOC calculation (UI and Badges)

[cookieukw]

Description

This PR introduces a new feature that allows users to exclude specific file categories (like Lockfiles, Configs, Build Scripts, etc.) from the overall Lines of Code (LOC) calculation. This provides a much more accurate representation of the actual source code written by developers

Key Changes:

• "Exclude" Menu: Added a new dropdown menu next to the search input, allowing users to quickly toggle predefined exclusion filters
• URL Synchronization: Active filters are synced to the URL (?activeFilters=...) so that the exact state can be easily shared
• Badge & OG Image Support: The activeFilters parameter is fully supported by the badge (/badge) and Open Graph image (/og-image) API endpoints, meaning users can now generate shields.io badges that exclude lockfiles/configs using ?activeFilters=jsonConfigs,lockfiles
• Backend handling: Instead of modifying the core backend, the filtering math is done in the Node.js API wrapper (src/lib/ghloc/api.ts). It traverses the returned JSON, strips out the ignored files, and automatically recalculates the total loc and locByLangs dictionary before passing it to the frontend
• Docs: Updated README.md with an example of how to use this parameter for badges

Filter Categories Added:

• jsonConfigs (e.g. package.json, tsconfig.json)
• lockfiles (e.g. pnpm-lock.yaml, go.sum)
• buildScripts (e.g. Makefile, webpack.config.js)
• environment (e.g. Dockerfile, .env)
• editorGit (e.g. .gitignore, .prettierrc)
• cachesAndBinaries (e.g. .png, .zip)

How I tested this:

• Tested the filtering in the UI (checking different combinations and verifying that the LOC count and file tree update correctly)
• Created a local HTTPS tunnel (via localhost.run/ngrok) to expose the local API endpoint to the internet and successfully rendered the actual SVGs on the live shields.io server
• Passed multiple query combinations to the badge URL to ensure the API safely handles parsing and ignores invalid values

exclude option

exclude menu

total lines (without exclude options)

with only three first exclude options

but is the badge (buildScripts, Clockfiles, jsonConfigs)

with only three last exclude options

but is the badge (cachesAndBinaries, editorGit, environment)

with all exclude options

but is the badge (buildScripts, Clockfiles, jsonConfigs, cachesAndBinaries, editorGit, environment)

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