app: drive /roadmap from GitHub milestones instead of static copy

[joelpeace48-cell]

Problem

app/roadmap/page.tsx is a placeholder, while the real roadmap now lives in
GitHub milestones across the three repositories. A hand-written roadmap page
starts drifting the day it ships.

What to do

• Fetch milestone progress from the GitHub API for all three repos at build
  time (or ISR with a sensible revalidation window).
• Show each milestone with its open/closed counts and completion percentage.
• Link through to the issue lists.
• Cache and degrade gracefully — a GitHub API failure must not break the page,
  and the token must stay server-side.

Acceptance criteria

• Live milestone data from all three repositories
• Progress per milestone with links to issues
• Graceful degradation when the API is unavailable
• No token in the client bundle

Notes

Delivery transparency is exactly what grant reviewers look for, and a roadmap
that updates itself is far more convincing than one that claims to be current.

[dmystical-coder]

Hi team, I would like to tackle this issue as part of the ongoing campaign. I'm a frontend and smart contract engineer actively building within the stellar ecosystem. I will build a clean, responsive component to map over the GitHub milestones, calculating the completion percentage using the open_issues and closed_issues data. Each milestone card will feature a visual progress bar and a direct link out to the respective GitHub issue query. Please, let me know if you are happy to assign this to me and I will open a PR shortly.

[joelpeace48-cell]

@dmystical-coder you are assigned, ensure all ci pipeline passes

[grantfox-oss]

🦊 GrantFox — @dmystical-coder has been assigned to this issue as part of the Third Campaign campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #55)
2. Your PR will be reviewed by the FinesseStudioLab maintainers

Good luck! Track your progress on GrantFox.