Add classic eye image assets and import scripts

- Generate 18 classic eye variants in 3 styles (realistic, anime, cartoon)
  with 6 colors each (blue, green, brown, hazel, grey, amber)
- Add scripts for generating, converting, and importing eyes:
  - generate_classic_eyes_ppm.py: Generate PPM images (no dependencies)
  - download_classic_eyes.py: Full-featured generator with PIL
  - startup_import_eyes.py: Import eyes on backend startup
  - import_saved_eyes.py: Import from saved directory
- Update docker-compose to mount scripts directory
- Include metadata.json for tracking eye properties

data/classic_eyes_ppm/convert_to_png.py

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+#!/usr/bin/env python3
+"""Convert PPM files to PNG using PIL."""
+from pathlib import Path
+from PIL import Image
+
+ppm_dir = Path(__file__).parent
+for ppm_file in ppm_dir.glob("*.ppm"):
+    png_file = ppm_file.with_suffix('.png')
+    img = Image.open(ppm_file)
+    img.save(png_file, 'PNG')
+    print(f"Converted: {ppm_file.name} -> {png_file.name}")

data/classic_eyes_ppm/metadata.json

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+[
+  {
+    "filename": "classic_realistic_blue.png",
+    "ppm_filename": "classic_realistic_blue.ppm",
+    "name": "Classic Realistic Eye - Blue",
+    "description": "A realistic style eye with blue iris color",
+    "tags": "eye,classic,realistic,blue,medium",
+    "width": 200,
+    "height": 200
+  },
+  {
+    "filename": "classic_realistic_green.png",
+    "ppm_filename": "classic_realistic_green.ppm",
+    "name": "Classic Realistic Eye - Green",
+    "description": "A realistic style eye with green iris color",
+    "tags": "eye,classic,realistic,green,medium",
+    "width": 200,
+    "height": 200
+  },
+  {
+    "filename": "classic_realistic_brown.png",
+    "ppm_filename": "classic_realistic_brown.ppm",
+    "name": "Classic Realistic Eye - Brown",
+    "description": "A realistic style eye with brown iris color",
+    "tags": "eye,classic,realistic,brown,medium",
+    "width": 200,
+    "height": 200
+  },
+  {
+    "filename": "classic_realistic_hazel.png",
+    "ppm_filename": "classic_realistic_hazel.ppm",
+    "name": "Classic Realistic Eye - Hazel",
+    "description": "A realistic style eye with hazel iris color",
+    "tags": "eye,classic,realistic,hazel,medium",
+    "width": 200,
+    "height": 200
+  },
+  {
+    "filename": "classic_realistic_grey.png",
+    "ppm_filename": "classic_realistic_grey.ppm",
+    "name": "Classic Realistic Eye - Grey",
+    "description": "A realistic style eye with grey iris color",
+    "tags": "eye,classic,realistic,grey,medium",
+    "width": 200,
+    "height": 200
+  },
+  {
+    "filename": "classic_realistic_amber.png",
+    "ppm_filename": "classic_realistic_amber.ppm",
+    "name": "Classic Realistic Eye - Amber",
+    "description": "A realistic style eye with amber iris color",
+    "tags": "eye,classic,realistic,amber,medium",
+    "width": 200,
+    "height": 200
+  },
+  {
+    "filename": "classic_anime_blue.png",
+    "ppm_filename": "classic_anime_blue.ppm",
+    "name": "Classic Anime Eye - Blue",
+    "description": "A anime style eye with blue iris color",
+    "tags": "eye,classic,anime,blue,medium",
+    "width": 200,
+    "height": 200
+  },
+  {
+    "filename": "classic_anime_green.png",
+    "ppm_filename": "classic_anime_green.ppm",
+    "name": "Classic Anime Eye - Green",
+    "description": "A anime style eye with green iris color",
+    "tags": "eye,classic,anime,green,medium",
+    "width": 200,
+    "height": 200
+  },
+  {
+    "filename": "classic_anime_brown.png",
+    "ppm_filename": "classic_anime_brown.ppm",
+    "name": "Classic Anime Eye - Brown",
+    "description": "A anime style eye with brown iris color",
+    "tags": "eye,classic,anime,brown,medium",
+    "width": 200,
+    "height": 200
+  },
+  {
+    "filename": "classic_anime_hazel.png",
+    "ppm_filename": "classic_anime_hazel.ppm",
+    "name": "Classic Anime Eye - Hazel",
+    "description": "A anime style eye with hazel iris color",
+    "tags": "eye,classic,anime,hazel,medium",
+    "width": 200,
+    "height": 200
+  },
+  {
+    "filename": "classic_anime_grey.png",
+    "ppm_filename": "classic_anime_grey.ppm",
+    "name": "Classic Anime Eye - Grey",
+    "description": "A anime style eye with grey iris color",
+    "tags": "eye,classic,anime,grey,medium",
+    "width": 200,
+    "height": 200
+  },
+  {
+    "filename": "classic_anime_amber.png",
+    "ppm_filename": "classic_anime_amber.ppm",
+    "name": "Classic Anime Eye - Amber",
+    "description": "A anime style eye with amber iris color",
+    "tags": "eye,classic,anime,amber,medium",
+    "width": 200,
+    "height": 200
+  },
+  {
+    "filename": "classic_cartoon_blue.png",
+    "ppm_filename": "classic_cartoon_blue.ppm",
+    "name": "Classic Cartoon Eye - Blue",
+    "description": "A cartoon style eye with blue iris color",
+    "tags": "eye,classic,cartoon,blue,medium",
+    "width": 200,
+    "height": 200
+  },
+  {
+    "filename": "classic_cartoon_green.png",
+    "ppm_filename": "classic_cartoon_green.ppm",
+    "name": "Classic Cartoon Eye - Green",
+    "description": "A cartoon style eye with green iris color",
+    "tags": "eye,classic,cartoon,green,medium",
+    "width": 200,
+    "height": 200
+  },
+  {
+    "filename": "classic_cartoon_brown.png",
+    "ppm_filename": "classic_cartoon_brown.ppm",
+    "name": "Classic Cartoon Eye - Brown",
+    "description": "A cartoon style eye with brown iris color",
+    "tags": "eye,classic,cartoon,brown,medium",
+    "width": 200,
+    "height": 200
+  },
+  {
+    "filename": "classic_cartoon_hazel.png",
+    "ppm_filename": "classic_cartoon_hazel.ppm",
+    "name": "Classic Cartoon Eye - Hazel",
+    "description": "A cartoon style eye with hazel iris color",
+    "tags": "eye,classic,cartoon,hazel,medium",
+    "width": 200,
+    "height": 200
+  },
+  {
+    "filename": "classic_cartoon_grey.png",
+    "ppm_filename": "classic_cartoon_grey.ppm",
+    "name": "Classic Cartoon Eye - Grey",
+    "description": "A cartoon style eye with grey iris color",
+    "tags": "eye,classic,cartoon,grey,medium",
+    "width": 200,
+    "height": 200
+  },
+  {
+    "filename": "classic_cartoon_amber.png",
+    "ppm_filename": "classic_cartoon_amber.ppm",
+    "name": "Classic Cartoon Eye - Amber",
+    "description": "A cartoon style eye with amber iris color",
+    "tags": "eye,classic,cartoon,amber,medium",
+    "width": 200,
+    "height": 200
+  }
+]