docs: add Community Projects section (cc-usage-board, ai-heatmap)

[huhjayeon]

Adds a Community Projects section to the README with two third-party tools that build on ccusage:

• cc-usage-board — local HTML dashboard with charts, a 90-day heatmap, and a SwiftBar menu bar plugin. Korean / Japanese / English UI.
• ai-heatmap — GitHub-style contribution heatmap of AI costs (Pages site + dynamic SVG via Vercel). Requested in Add ai-heatmap to README as a community project #852.

Happy to revise wording, drop either entry, or move the section elsewhere.

Summary by CodeRabbit

• Documentation
  • Added a "Community Projects" section highlighting two community tools:
    • cc-usage-board — local bilingual dashboard with multiple charts, activity heatmap, and SwiftBar plugin.
    • ai-heatmap — GitHub-style cost heatmap usable as static pages or dynamic SVG for hosted deployments.

[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: 33281277-1811-439c-922d-69f409face42

📥 Commits

Reviewing files that changed from the base of the PR and between bdb674d and ef6d34e.

📒 Files selected for processing (1)

• apps/ccusage/README.md

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📝 Walkthrough

Walkthrough

Adds a new "Community Projects" section to apps/ccusage/README.md documenting two third-party projects: cc-usage-board (local bilingual dashboard with charts and SwiftBar plugin) and ai-heatmap (GitHub-style cost heatmap via static pages or dynamic SVG).

Changes

Community Projects Documentation

Layer / File(s)	Summary
Community Projects section apps/ccusage/README.md	Adds a "Community Projects" section describing cc-usage-board (local HTML dashboard, English/Korean UI, locale-aware units, multiple charts, activity heatmap, optional SwiftBar plugin) and ai-heatmap (GitHub-style cost heatmap served via GitHub Pages or dynamic SVG on Vercel).

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related issues

• Add ai-heatmap to README as a community project #852: Adds ai-heatmap to the README, matching this PR's addition of community projects.

Possibly related PRs

• ryoppippi/ccusage#119: Also modifies README to add community/related project entries.

Suggested reviewers

• ryoppippi

Poem

🐰 In README light the projects bloom,
Two tools now listed make the page less gloom,
Dashboards in two tongues, heatmaps that gleam,
Little community sparks fuel the dream. ✨

🚥 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 clearly and concisely summarizes the main change: adding a Community Projects section with two specific community tools (cc-usage-board and ai-heatmap).
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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[huhjayeon]

Update — cc-usage-board now ships with full Japanese support (UI + menu bar plugin + README):

• Trilingual cycle: 한국어 → 日本語 → English in one click
• Japanese number units (万 / 億) alongside Korean (만 / 억) and English (K / M / B)
• README.ja.md added
• SwiftBar plugin language is auto-detected from $LANG (ja_* → JA) and switchable from the menu

Since ccusage was originally built by you in Japan, I figured Japanese-speaking
Claude Code users would benefit. Happy to revise this PR if anything in the
proposed README addition should change.

[huhjayeon]

Extended the PR to also include ai-heatmap, which was requested in #852, and tightened the cc-usage-board entry to match the surrounding "ccusage Family" style. Title/body updated accordingly.

cc @seunggabi — including ai-heatmap as you requested in #852.