Add Quartz service for serving Obsidian notes at /notes/

Replaces the custom Go/Vue notes system with Quartz v4, a polished
static site generator for Obsidian vaults. Mounts OBSIDIAN_DIR as the
Quartz content directory and serves it at /notes/ with hot-reload via
`npx quartz build --serve`.

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

docker-compose.yml

@@ -31,6 +31,7 @@ services:
             - icecast2
             - gitea
             - hasura
+            - quartz
         networks:
             - app-network
         ports:
@@ -115,6 +116,19 @@ services:
         ports:
             - "${LIQUIDSOAP_HARBOR_PORT:-8001}:${LIQUIDSOAP_HARBOR_PORT:-8001}"
 
+    quartz:
+        build:
+            context: ./quartz
+            dockerfile: Dockerfile
+        container_name: "${QUARTZ_HOST}"
+        restart: always
+        networks:
+            - app-network
+        env_file:
+            - ./.env
+        volumes:
+            - ${OBSIDIAN_DIR}:/quartz/content:ro
+
     gitea-runner:
         image: gitea/act_runner:latest
         container_name: "${GITEA_RUNNER_HOST}"