feat(couchdb): 添加 CouchDB 配置文件和生成脚本

- 添加 CouchDB 的 Docker 配置文件和环境变量配置
- 添加用于生成 Obsidian LiveSync 配置的 Python 脚本

dbSer/couchdb/stack.yml

@@ -0,0 +1,17 @@
+services:
+  couchdb:
+    image: ${IMAGE_TAG:-couchdb:3.5}
+    container_name: couchdb
+    restart: unless-stopped
+    ports:
+      - 5984:5984
+    volumes:
+      - ./etc/couchdb/local.d:/opt/couchdb/etc/local.d
+      - ./couchdb:/opt/couchdb/data
+    environment:
+      TZ: Asia/Shanghai
+      PUID: 99
+      PGID: 100
+      UMASK: 0022
+      COUCHDB_USER: your_custom_user
+      COUCHDB_PASSWORD: your_strong_password