refactor: clean Docker files and restore standalone model services

- Remove all Docker-related files (Dockerfiles, compose.yaml)
- Remove documentation files (README, ARCHITECTURE, docs/)
- Remove old core/ directory (base_service, service_manager)
- Update models.yaml with correct service_script paths (models/*/server.py)
- Simplify vLLM requirements.txt to let vLLM manage dependencies
- Restore original standalone vLLM server (no base_service dependency)
- Remove obsolete vllm/, musicgen/, flux/ directories

Process-based architecture is now fully functional on RunPod.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

model-orchestrator/models.yaml

@@ -6,7 +6,7 @@ models:
   qwen-2.5-7b:
     type: text
     framework: vllm
-    service_script: vllm/server.py
+    service_script: models/vllm/server.py
     port: 8001
     vram_gb: 14
     startup_time_seconds: 120
@@ -17,7 +17,7 @@ models:
   flux-schnell:
     type: image
     framework: openedai-images
-    service_script: flux/server.py
+    service_script: models/flux/server.py
     port: 8002
     vram_gb: 14
     startup_time_seconds: 60
@@ -28,7 +28,7 @@ models:
   musicgen-medium:
     type: audio
     framework: audiocraft
-    service_script: musicgen/server.py
+    service_script: models/musicgen/server.py
     port: 8003
     vram_gb: 11
     startup_time_seconds: 45