feat(ugc): make models like LU Toolbox does, within CPU and memory budgets

Parity with LU Toolbox's Process Model, Bake Lighting and icon renderer, with
its defaults as the settings' defaults:

- Colors from its LU palette (UgcPalette: LU colors, LDD colors mapped to the
  nearest LU one, unknown ones black), transparent bricks at 58.82% opacity, a
  brick transparent only when all of its materials are.
- Color variation: each brick's material gets its HSV value shifted in a 2.224
  gamma by up to 5% (times the color's own amount), from a random number of
  the model, brick and material, so reprocessing gives the same colors in
  every LOD. Icons get none, and the icon renderer's color corrections.
- LODs 0 and 2 with its distance logic, written as NiLODNode/NiRangeLODData
  like its exports and the game's own brick models, shapes divided at 65535
  vertices along the longest side like divide_mesh.
- Ambient occlusion like its AO-only bake: 64 rays per vertex, distance 5,
  after hidden surface removal, transparent bricks neither baked nor
  occluding, glow colors added.
- Icons from its icon scene: 50 mm lens at 53.4/19.5 degrees, sun of 2.5 at
  21/50.3 degrees with soft shadows, grey world light with occlusion; LOD 0's
  hidden surface removal and occlusion are reused for them.
- Optional ground plane for hidden surface removal; stats.json per model and
  the previous version's previews kept for comparing.

Budgets, applied live on config reload: max_cpu_percent (workers account
their thread CPU time and sleep to stay under it, long renders included),
worker_nice, max_memory_mb (jobs are estimated from their brick count and
wait until they fit), max_model_bricks and pause_hours. /status and the
traffic report show CPU, memory and throttling.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

resources/ugcconfig.ini

@@ -22,27 +22,76 @@ ugc_max_storage_mb=2048
 # Worker threads making files (0: half the CPU cores)
 worker_threads=0
 
+# How much of the machine making files may use (changes apply while running):
+# max_cpu_percent: the workers together average at most this share of all CPU cores (0: no limit); they pause
+#   between bits of work to stay under it, long renders included.
+# worker_nice: the workers' scheduling priority on Linux, 0 (normal) to 19 (only when nothing else wants the CPU).
+# max_memory_mb: jobs whose estimated memory would go past this together wait for running ones to finish; a job
+#   bigger than it alone runs when nothing else does (0: no limit).
+# max_model_bricks: models with more bricks fail with that reason instead of being made (0: no limit).
+# pause_hours: local hours in which no new jobs start, e.g. 18-23 or 22-6 (empty: never).
+max_cpu_percent=0
+worker_nice=0
+max_memory_mb=0
+max_model_bricks=0
+pause_hours=
+
 # How often to look for models to make (milliseconds), how many to take at once, and how often a model may fail
 # before it's given up on (the dashboard can try again)
 poll_interval_ms=2000
 poll_batch=32
 max_attempts=3
 
-# Brick detail used for meshes and icons: 0 (most detailed) to 2
-brick_lod=0
+# Models are made like LU Toolbox's Process Model and Bake Lighting make them; these default to its settings.
+# color_palette: lu_toolbox (its LU palette, unknown colors black) or brickdb (the client's Materials.xml).
+# color_variation: each brick's brightness is shifted by up to this percent (the same every time; 0: none).
+# transparent_opacity: transparent bricks' opacity in percent.
+color_palette=lu_toolbox
+color_variation=5
+transparent_opacity=58.82
 
-# Remove faces that can't be seen from anywhere, and darken hidden corners (ambient occlusion baked into the vertex
-# colors): 0 or 1. ao_strength: 0 (none) to 1. optimize_resolution: detail of the renders that decide both.
+# Levels of detail made, from the client's brickprimitives (0 most detailed, 2 least), and the distances they're
+# drawn at (LU Toolbox picks each level's range from these by which levels are made; lod_cull: drawn up to).
+lods=0,2
+lod_distance_0=0
+lod_distance_1=50
+lod_distance_2=100
+lod_distance_3=280
+lod_cull=10000
+
+# The shapes' shader number: S<shader>_Opaque_Model (transparent shapes are S01_Alpha_Model)
+shader_opaque=01
+
+# Remove faces that can't be seen from anywhere (optimize_resolution: detail of the renders that decide it;
+# hsr_ground_plane: 1 also removes what can only be seen from below the model)
 remove_hidden_faces=1
-bake_ao=1
-ao_strength=0.6
+hsr_ground_plane=0
 optimize_resolution=1024
 
-# Icons: size in pixels, the camera's angle around (yaw, from the model's front) and above (pitch) the model in degrees,
-# and the empty border (1 fills the icon). Modular builds (cars, rockets) have their own angles.
+# Bake ambient occlusion into the vertex colors: rays per vertex, how far they look, strength 0 (none) to 1, and how
+# much glowing colors add
+bake_ao=1
+ao_samples=64
+ao_distance=5
+ao_strength=1
+glow_strength=6
+
+# Icons, set up like LU Toolbox's icon renderer: size in pixels, the camera's angle around (yaw, from the model's
+# front) and above (pitch) in degrees, its field of view, the empty border (1 fills the icon), the sun's angles and
+# strength, the world light, shadows and ambient occlusion, its color corrections and color variation (percent).
+# Modular builds (cars, rockets) have their own camera angles.
 icon_size=128
-icon_yaw=35
-icon_pitch=25
+icon_yaw=53.36
+icon_pitch=19.54
+icon_fov=39.6
 icon_margin=1.03
-modular_icon_yaw=35
-modular_icon_pitch=20
+icon_sun_yaw=21
+icon_sun_pitch=50.3
+icon_sun_strength=2.5
+icon_ambient=0.192
+icon_shadows=1
+icon_ao=1
+icon_correct_colors=1
+icon_color_variation=0
+modular_icon_yaw=53.36
+modular_icon_pitch=19.54