fix(biomes): remove cross-climate tag leaks (copper/gold in temperate spawn)

minecraft:birch_forest was listed in BOTH latitude_hot_surface AND
latitude_temperate_surface. Since ore generation is gated on the climate
tags, the hot-band ores (copper, pure gold, redstone) were spawning in
birch_forest - the default temperate spawn biome - so players found copper
in what looks like a temperate forest. birch_forest is a vanilla temperate
biome (temperature 0.6) and is the configured safe spawn; it never belonged
in the hot tag. Removed from hot, kept in temperate.

Also fixed a second leak: minecraft:windswept_forest was in BOTH temperate
AND cold, so it received both temperate (iron/coal) and cold (lapis/diamond)
ores. Kept in temperate only (windswept forest is not a genuinely cold biome
like snowy/taiga/grove).

Validated: each surface biome now belongs to exactly one climate tag (no
overlap). Latitude GameTest still green: spawn=birch_forest | north=100% |
south=100% | swamp=1.26% | deepDark=1.30% | caveBiomes=6.5%.

src/main/resources/data/custom_ore_gen/tags/worldgen/biome/latitude_cold_surface.json

@@ -8,7 +8,6 @@
     "minecraft:old_growth_pine_taiga",
     "minecraft:old_growth_spruce_taiga",
     "minecraft:windswept_hills",
-    "minecraft:windswept_forest",
     "minecraft:windswept_gravelly_hills",
     "minecraft:grove",
     "minecraft:snowy_slopes",

src/main/resources/data/custom_ore_gen/tags/worldgen/biome/latitude_hot_surface.json

@@ -11,7 +11,6 @@
     "minecraft:jungle",
     "minecraft:sparse_jungle",
     "minecraft:bamboo_jungle",
-    "minecraft:birch_forest",
     {
       "id": "biomesoplenty:dryland",
       "required": false