Merge Variant Gallery into main chapters: TSP top-down functional into 17.4, LRU linked-list family into 18.1, coin/BFS/counting into 2.16, N-Queens set-based into 12.4, Eulerian trio into 17.9, WL2 forward-BFS into 6.13, LFU lean into 18.2, TreeSet median into 7.3, Kahn filter-seed into 6.3/6.8, functional/map-key/structure sections into their chapters; delete ch19-gallery; add proper pages 8.10 Basic Calculator II, 10.12 Rank Transform, 10.13 Unique Occurrences, 16.8 Pow(x,n) · arpanpathak/AdvancedAlgorithmPatterns@d42073f

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