fix(lobby): ship real portal textures; they pointed at vanilla paths

The four portal blocks referenced vanilla texture paths from their own pack
(emerald_block, amethyst_block, prismarine_bricks, end_portal_frame_top)
without shipping those files. While the blocks rendered through the legacy
blocks.json path this was invisible; once minecraft:geometry made
material_instances take effect the lookup failed outright and they rendered
as missing-texture.

Ships real 16x16 textures generated through scripts/build-textures.py: a dark
stone frame around a glowing field, one hue per destination -- jamie green,
lyla purple, mya teal, plus a gold-ringed frame. terrain_texture.json now
points at these instead of vanilla paths, so every key in the pack resolves
to a file the pack actually contains.

lobby_transfer_RP bumped to 1.0.1 so clients re-download rather than serving
cached art; the lobby world pin was updated to match.

Known issue, not fixed here: lobby_transfer_RP and hub_return_transfer_BP
share pack UUID b2c3d4e5-1111-2222-3333-fedcba654321. They never load on the
same server today, so the collision is latent, but it makes version bumps on
either pack risky and should be resolved with a fresh UUID plus a pin update.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015Gf1kZypRDfPL1YiWUS1LC

lobby-addon/lobby_transfer_RP/manifest.json

@@ -4,14 +4,26 @@
     "name": "Lobby Portal Transfer Resources",
     "description": "Textures and lang for craftable portal blocks",
     "uuid": "b2c3d4e5-1111-2222-3333-fedcba654321",
-    "version": [1, 0, 0],
-    "min_engine_version": [1, 21, 0]
+    "version": [
+      1,
+      0,
+      1
+    ],
+    "min_engine_version": [
+      1,
+      21,
+      0
+    ]
   },
   "modules": [
     {
       "type": "resources",
       "uuid": "b2c3d4e5-4444-5555-6666-fedcba987654",
-      "version": [1, 0, 0]
+      "version": [
+        1,
+        0,
+        1
+      ]
     }
   ]
 }

lobby-addon/lobby_transfer_RP/textures/terrain_texture.json

@@ -5,16 +5,16 @@
   "num_mip_levels": 4,
   "texture_data": {
     "portal_frame": {
-      "textures": "textures/blocks/end_portal_frame_top"
+      "textures": "textures/blocks/portal_frame"
     },
     "portal_jamie": {
-      "textures": "textures/blocks/emerald_block"
+      "textures": "textures/blocks/portal_jamie"
     },
     "portal_lyla": {
-      "textures": "textures/blocks/amethyst_block"
+      "textures": "textures/blocks/portal_lyla"
     },
     "portal_mya": {
-      "textures": "textures/blocks/prismarine_bricks"
+      "textures": "textures/blocks/portal_mya"
     },
     "portal_field": {
       "textures": "textures/blocks/portal_field"