feat: cross-platform compose (Ubuntu CDI + Windows Docker Desktop GPU)

Base compose is GPU-agnostic; GPU is added by a per-OS override selected via
COMPOSE_FILE in .env (docker-compose.gpu-linux.yml for Ubuntu/CDI,
docker-compose.gpu-windows.yml for Windows 11 Docker Desktop). Adds .env.example
split-deployment section + docs/DEPLOY.md covering all-in-one and browser+bot
layouts on both OSes.

docker-compose.gpu-windows.yml

@@ -0,0 +1,26 @@
+# GPU override for WINDOWS 11 (Docker Desktop + WSL2 + NVIDIA) and any host
+# that exposes the GPU through Docker's portable device-reservation API rather
+# than CDI. Requires the NVIDIA GPU driver on Windows and GPU support enabled in
+# Docker Desktop (Settings → Resources → WSL Integration / GPU).
+#
+#   docker compose -f docker-compose.yml -f docker-compose.gpu-windows.yml up -d
+#
+# Or set COMPOSE_FILE in .env (recommended):
+#   COMPOSE_FILE=docker-compose.yml:docker-compose.gpu-windows.yml
+services:
+  ollama:
+    deploy:
+      resources:
+        reservations:
+          devices:
+            - driver: nvidia
+              count: all
+              capabilities: [gpu]
+  javis:
+    deploy:
+      resources:
+        reservations:
+          devices:
+            - driver: nvidia
+              count: all
+              capabilities: [gpu]