perf(img2img): mount FLUX as read-only volume at /models/flux (no more 24GB re-download on rebuild); docs: architecture.md; UI: How-This-Works + upload label, drop corner video

fix(img2img): add peft (load_lora_weights needs it) + isolate LoRA load so a failure falls back to base; UI: How-This-Works guide + upload label, drop corner video

fix(img2img): retry+resume FLUX download (CDN drops mid-shard); UI: timeline date/year/time, polaroids -12%, 素材 in top bar, modal readability panel, white hummingbird logo

feat: immersive Cesium watercolour (stamen imagery + paint post-process + chase cam), polaroid polish (tiny-mono dd/mm/yyyy, 4/5 aspect, longer caption), timeline by date, fix 2D map expand collapse, stadia key config

fix(img2img): disable Xet downloader (was crawling at 1kB/s / failing writes) so the FLUX pre-fetch completes over standard HTTPS

fix(img2img): pre-download FLUX in main process (writable), worker loads read-only from cache; drop ineffective preload

fix(img2img): low_cpu_mem_usage to avoid worker OOM, bump GPU duration to 180s, surface real build error in 500

merge: SSE refactor + ZeroGPU img2img watercolour develop

feat: Sozai app with ZeroGPU img2img watercolour develop (staged LoRA)