Rename image fields and implement werk-in-detail gallery

- Rename image_main/image_secondary/image_logo/image_portrait to
  portret/extra_1/logo/extra_2 in pages, blueprints, and templates
- Add extra_2 image slot to home and CV (hidden on mobile)
- Wire werk-in-detail to real child pages instead of picsum placeholders
- Remove glightbox CDN dependency from werk-in-detail
- Add album blueprint, template, and grote-objecten album page

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

user/pages/04.werk-in-detail/grote-objecten/album.en.md

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+---
+title: 'Large objects'
+sitemap:
+    lastmod: '13-06-2026 13:29'
+---
+
+A series of larges objects made in the last years

user/pages/04.werk-in-detail/grote-objecten/album.nl.md

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+---
+title: 'Grote objecten'
+sitemap:
+    lastmod: '13-06-2026 13:29'
+media_order: '10298359_1112080642156692_2004541195504715933_o_1112080642156692.jpg,1936306_1105443762820380_8216889586053322199_n_1105443762820380.jpg,10683502_1112079375490152_4488529684021326036_o_1112079375490152.jpg,11053920_1112081192156637_6689568670232240087_o_1112081192156637.jpg,12029743_1107926249238798_5277465818662466467_o_1107926249238798.jpg,12418905_1112080445490045_6622839067204183466_o_1112080445490045.jpg,12418905_1112080975489992_3344234153253759058_o_1112080975489992.jpg,12418926_1112081552156601_1127226366914273536_o_1112081552156601.jpg,12493616_1112080162156740_7951360208797715360_o_1112080162156740.jpg,12495917_1112079482156808_5584179686913736172_o_1112079482156808.jpg,12496352_1112081338823289_3609436053778783843_o_1112081338823289.jpg,12593704_1112080822156674_1315022773915505238_o_1112080822156674.jpg'
+---
+
+Een serie van grote objecte gemaakt in de afgelopen jaren