Turn members map prototype into a landable members page

[ashryanbeats]

Context

Hackathon PR #72 explored a /members page with a Leaflet map and localized page wrapper. The PR should be treated as prototype/reference work rather than merged directly.

Goal

Decide whether the site should have a members page, then rebuild or clean up the prototype into a privacy-safe, maintainable feature.

Prototype references

• PR Members page with a map of community members #72: Members page with a map of community members #72

Known concerns from the hackathon audit

• Contains fake/sample member data.
• Adds Leaflet dependencies.
• Modifies generated src/data/composite-feed.json.
• Fetches Meetup data during build for hosted-events stats.
• Has known navigation/localization bugs.

Acceptance criteria

• Replace or remove sample member data before merge.
• Define the source of truth for real member/profile data and any privacy rules.
• Keep generated files generated; do not hand-edit src/data/composite-feed.json.
• Fix localized routes/navigation for English and Japanese pages.
• Avoid build-time external fetches unless intentionally accepted and documented.
• Add appropriate tests or documented manual verification for the page.
• Run full project checks before opening the final PR.

Notes

This should be handled as a fresh feature branch or a heavily cleaned PR, not a direct merge of the prototype.