Add dark mode palettes + Woodpecker CI pipeline

- Add 2 dark palettes (Nuit, Ocean) to DisplaySettings with full SVG
  theme tokens — all hardcoded SVG colors (grids, legends, text fills,
  pills, dot strokes, drag handles) replaced with reactive bindings
- Update scoped CSS to use var(--color-*) and var(--svg-*) throughout
- Add Woodpecker CI pipeline (.woodpecker.yml): build → docker push → deploy
- Add multi-stage Dockerfiles for backend (Python) and frontend (Nuxt)
- Add production docker-compose with Traefik labels + dev override
- Remove old single-stage Dockerfiles and root docker-compose.yml
- Update Makefile with docker-dev target
- Exclude data files (pdf, xls, ipynb) from git

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docker/docker-compose.dev.yml

@@ -0,0 +1,26 @@
+services:
+  backend:
+    build:
+      target: development
+    environment:
+      DATABASE_URL: sqlite+aiosqlite:///./sejeteralo.db
+      SECRET_KEY: dev-secret-key
+      DEBUG: "true"
+      CORS_ORIGINS: '["http://localhost:3000"]'
+    ports: !override
+      - "8000:8000"
+    volumes:
+      - ../backend:/app
+    labels: []
+
+  frontend:
+    build:
+      target: development
+    environment:
+      NUXT_PUBLIC_API_BASE: http://localhost:8000/api/v1
+    ports: !override
+      - "3000:3000"
+      - "24678:24678"
+    volumes:
+      - ../frontend:/app
+    labels: []