feat(packs): Fancy dies as a mode → topdown packs; Roguelike Dungeon tile pack (B)

Modes are TECHNIQUES; 'Fancy' (tiles+FX) was really a topdown PACK, so:
- Remove 'fancy' from RENDER_MODES (saved 'fancy' falls back to tiles; its dead
  Pixi branch is short-circuited by canUseMode). Modes = Tiled/ASCII/Iso/3D.
- Modes now carry a ; a premium mode unlocks once the user has ANY
  unlocked pack for that projection (not a single hardcoded pack) — needed now
  that iso is multi-pack.
- New 'roguelike-dungeon' topdown pack: same sheet, a DUNGEON palette (stone
  floors + barrels/crates vs the wood interior) — a distinct 2D tileset with zero
  new assets. Registered + catalog (migration 027, topdown tier 1 / 1 credit).
  The tiled renderer's lighting/shadows/vignette are the built-in FX.
- Also: iso facing fix (Male 0=NW..6=NE) reflected in tests.

So the Tiled pack picker now offers Roguelike Interior <-> Dungeon, and Iso offers
Dungeon <-> Medieval — packs as products, proven in the best-looking mode too.
Suite 58/419 green.

src/multiplayer/entitlements.js

@@ -21,6 +21,10 @@ const DEFAULT_CATALOG = Object.freeze({
         id: 'generated-skins', label: 'Premium Generated Skins', kind: 'render-pack',
         projection: 'topdown', tier: 1, unlockMinCredits: 1, grantOnly: false, premium: true
     }),
+    'roguelike-dungeon': Object.freeze({
+        id: 'roguelike-dungeon', label: 'Roguelike Dungeon (Tiles)', kind: 'render-pack',
+        projection: 'topdown', tier: 1, unlockMinCredits: 1, grantOnly: false, premium: true
+    }),
     'iso-dungeon': Object.freeze({
         id: 'iso-dungeon', label: 'Kenney Isometric Dungeon', kind: 'render-pack',
         projection: 'iso', tier: 2, unlockMinCredits: 10, grantOnly: false, premium: true