ci(data): add place validator + fix gmaps_link format errors

[yakew7]

What this changes

• Add scripts/validate-places.mjs: checks all data/places/*.json for unique ids, valid type, valid coordinates (global bounds), required gmaps_link (accepts maps.google.com, maps.app.goo.gl, www.google.com/maps, goo.gl/maps), and no em dashes; exits 1 with clear per-field errors
• Add validate npm script; wire validate-data job into ci.yml (no npm install needed - pure Node built-ins)
• Fix 9 mul-book_shop entries: restore original maps.app.goo.gl short links, remove trailing spaces; restore mum- Closes ci: validate data/places/*.json on PR #23

Type of change

• New public place(s)
• New or updated benefit guide
• New or updated resource link
• Code or fix
• Docs

Proof (required for new public places)

Fill this in for every place added in this PR. It stays in the PR, not in the
dataset.

Field	Value
Source or citation
Google Maps rating (must be >= 4.0)
Google Maps review count (must be >= 50)
Date verified

• Each place's rating is 4.0 or higher.
• Each place has 50 or more reviews.
• Coordinates point to the correct entrance.
• The JSON record stops at gmaps_link and added_by (no proof fields committed).

Checklist

• The site hosts no copyrighted files; resource and paper changes are links only.
• No em dashes in any copy.

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