Make video enhancement fully AI-on-CoderAI and rework township outcomes.

Upscaling (Real-ESRGAN / SD upscalers):
- Support diffusers-style .safetensors weights + config.json (e.g.
  hlky/RealESRGAN_*), not just classic .pth; infer RRDBNet arch/scale from
  config. fp16 + tiling for performance.
- AI-or-fail: no ffmpeg fallback. Auto-select a configured upscaler when the
  request omits a model (find_capable_model).
- Fix a registry-pollution bug: cache upscalers in a private dict, never under
  a synthetic 'upscale:<id>' key in multi_model_manager.models (which made a
  later request_model() resolve/reload the bogus key -> 400).
- Per-frame progress + a first-class "upscale" task (pause/cancel/thermal),
  with a periodic thermal re-check through the frame loop.

Interpolation (RIFE):
- AI-or-fail: removed the ffmpeg minterpolate fallback. Resolve the
  rife-ncnn-vulkan binary + bundled model robustly, pass exact -n frame count,
  and pin -g to the SAME GPU CoderAI uses (matched by CUDA device name, not a
  hardcoded index). Progress + "interpolate" task + thermal guard.

Township generator:
- One draw per match (not per fighter); longer, configurable outcome videos
  built as a finish -> victory two-shot sequence; richer, more brutal,
  camera-aware prompts (finish/victory templates editable on the Prompts page).
- Stream large results via response_format=url instead of base64-in-JSON;
  per-frame progress for both upscale and interpolate.

Configurable temp dir:
- New --tmp CLI flag and config.tmp_dir (+ admin Settings field, applied live).
  Sets tempfile.tempdir and TMPDIR/TMP/TEMP so all scratch (frame extraction,
  upscaling, interpolation) and child processes use it — fixes
  "[Errno 28] No space left on device" when /tmp is small.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>