🎨 Add 42 new demo assets - Kai animations, zombies, buildings, terrain, environment

Generated assets (dual-style):
- Kai run animations (East/West, 16 frames)
- Kai portrait (neutral, 2 styles)
- Zombie walk/attack cycles (6 frames)
- Buildings: shack, campfire, well, chest (8 assets)
- Terrain: stone path, grass variation (4 tiles)
- Environment: oak tree, rock, bush, storage (10 objects)

Total: 42 new PNG files (21 base × 2 styles)
+ Batch generation scripts and manifests
+ Demo readiness checklist

BATCH_GENERATION_README.md

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+# 🚀 BATCH ASSET GENERATION
+
+Avtomatska generacija 126 assetov z dual-style sistemom.
+
+## Quick Start
+
+```bash
+# Start generation
+python3 scripts/batch_generation_runner.py
+```
+
+## Features
+
+✅ **126 assetov** (63 base × 2 styles)  
+✅ **Live progress tracking** - vidiš koliko je narejeno  
+✅ **Preview creation** - 256x256 slike za ogled  
+✅ **Auto logging** - v `logs/` mapi  
+✅ **Resume capability** - če se prekine, nadaljuj  
+✅ **ETA calculation** - ocena preostanka časa  
+
+## What It Does
+
+1. **Reads manifest** - BATCH_GENERATION_MANIFEST.json
+2. **Generates images** - Uses Gemini 2.0 Flash
+3. **Saves to folders** - Proper demo/ structure
+4. **Creates previews** - 256x256 for viewing
+5. **Logs everything** - Progress + errors
+
+## Generated Assets
+
+### Kai Animations (28)
+- Run East/West (8 frames)
+- Weapon actions (sword, axe)
+- Portraits (neutral, happy, sad)
+
+### Zombies (22)
+- Walk cycle (4 frames)
+- Attack cycle (4 frames)
+- Variants (runner, bloated, corpse)
+
+### Terrain (22)
+- Grass variations (4)
+- Stone paths (4)
+- Corners (4)
+
+### Environment (26)
+- Trees (oak, pine, dead)
+- Rocks (small, medium, large)
+- Plants (bushes, flowers, grass, weeds)
+
+### Buildings (12)
+- Shack, campfire, well
+- Storage, scarecrow, compost
+
+### NPCs (16)
+- Trader, Blacksmith
+- Healer, Traveler
+
+## Live Monitoring
+
+**While running:**
+```bash
+# In another terminal, watch progress:
+tail -f logs/batch_generation_*.log
+
+# Or check latest images:
+ls -lt assets/images/demo/characters/ | head
+```
+
+## If Interrupted
+
+**Resume from last position:**
+```bash
+# It will tell you the asset number
+python3 scripts/batch_generation_runner.py --resume 45
+```
+
+## Output Structure
+
+```
+assets/images/demo/
+  characters/
+    kai_run_east_1_styleA.png
+    kai_run_east_1_styleA_preview_256x256.png
+    kai_run_east_1_styleB.png
+    kai_run_east_1_styleB_preview_256x256.png
+    ...
+  terrain/
+  environment/
+  buildings/
+  npcs/
+```
+
+## Timing
+
+- **Per asset**: ~15 seconds
+- **Total time**: ~30-60 minutes
+- **126 assets** with previews
+
+## After Generation
+
+1. **Check previews** in each folder
+2. **Run background removal**:
+   ```bash
+   python3 scripts/remove_bg_advanced.py assets/images/demo/
+   ```
+3. **Organize into subfolders**:
+   ```bash
+   python3 scripts/organize_all_assets.py
+   ```
+
+---
+
+**Created:** 2025-12-31  
+**Status:** Ready to run! 🚀