Add GPU-aware image model detection and setup-image-models.sh

- Both setup scripts now detect VRAM and determine which image gen
  models the GPU can run (SD 1.5 at 4GB, SDXL at 8GB, Flux at 12-20GB)
- New setup-image-models.sh: interactive script that detects GPU,
  shows available models with VRAM requirements, and installs into
  InvokeAI and/or ComfyUI. Supports --auto for unattended install.
- Scales from 4GB cards through dual RTX 5000s to high-end 48GB cards
- README: added image gen VRAM tier table, expanded inpainting docs
  with practical fix recipes (hands, fingers, eyes, backgrounds),
  mask tips, and denoising strength guidance
- Setup end messages now show image gen capabilities and point to
  setup-image-models.sh instead of manual model install instructions

https://claude.ai/code/session_01PtYTPherSJaxDEVPgF6Nxu

local-ai-setup.sh

@@ -54,10 +54,37 @@ else
 fi
 EMBED_MODEL="nomic-embed-text"
 
+# ── Image generation model tiers (VRAM-aware) ────────────────────────────────
+# These vars are used by setup-image-models.sh and printed in status output.
+# Image gen shares GPU with Ollama — Ollama unloads after KEEP_ALIVE timeout,
+# so image gen gets full VRAM when Ollama is idle.
+if   [[ "$TOTAL_VRAM" -ge 24 ]]; then
+    IMG_MODELS="SD 1.5, SDXL, SDXL Turbo, Flux.1-dev, Flux.1-schnell"
+    IMG_TIER="all models including Flux"
+    IMG_DEFAULT="SDXL"
+elif [[ "$TOTAL_VRAM" -ge 12 ]]; then
+    IMG_MODELS="SD 1.5, SDXL, SDXL Turbo, Flux.1-schnell (tight)"
+    IMG_TIER="SDXL + Flux-schnell"
+    IMG_DEFAULT="SDXL"
+elif [[ "$TOTAL_VRAM" -ge 8 ]]; then
+    IMG_MODELS="SD 1.5, SDXL (tight at 512px), SDXL Turbo"
+    IMG_TIER="SD 1.5 comfortable, SDXL possible"
+    IMG_DEFAULT="SD 1.5"
+elif [[ "$TOTAL_VRAM" -ge 4 ]]; then
+    IMG_MODELS="SD 1.5 (float16)"
+    IMG_TIER="SD 1.5 only"
+    IMG_DEFAULT="SD 1.5"
+else
+    IMG_MODELS="none (CPU generation extremely slow)"
+    IMG_TIER="CPU only — not recommended"
+    IMG_DEFAULT=""
+fi
+
 section "Local AI Stack — $($IS_UPDATE && echo UPDATE || echo NEW INSTALL)"
 info "Base    : $BASE"
 info "IP      : $LOCAL_IP"
 info "GPU     : ${VRAM_GB}GB VRAM → $TIER"
+info "Image   : $IMG_TIER ($IMG_MODELS)"
 
 
 write_if_new() {
@@ -879,6 +906,7 @@ fi
 echo ""
 echo -e "${GREEN}${BOLD}━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━${NC}"
 echo -e "${GREEN}${BOLD}  Done!  GPU: ${VRAM_GB}GB → $TIER${NC}"
+echo -e "${GREEN}${BOLD}  Image gen: $IMG_TIER${NC}"
 echo -e "${GREEN}${BOLD}━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━${NC}"
 echo ""
 echo -e "  ${CYAN}Open WebUI${NC}  →  http://$LOCAL_IP:3000"