Initial production-ready Gemma 3 vLLM ROCm stack

Co-Authored-By: Oz <oz-agent@warp.dev>

.gitignore

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+# Environment and secrets
+.env
+backend/config/model.env
+frontend/config/frontend.env
+
+# Python
+__pycache__/
+*.pyc
+*.pyo
+*.pyd
+.venv/
+venv/
+
+# Editor / OS
+.DS_Store
+.idea/
+.vscode/
+
+# Logs
+*.log
+
+# Runtime data
+backend/data/
+frontend/data/
+models/