feat: add Docker infrastructure scaffold

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

.env.example

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+MIHOMO_API=http://mihomo:9090
+MIHOMO_SECRET=changeme
+MIHOMO_CONFIG_DIR=/data/mihomo
+DATABASE_URL=sqlite+aiosqlite:////data/db/app.db
+ADMIN_USER=admin
+ADMIN_PASSWORD=changeme
+HOST_DOMAIN=

.gitignore

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+.env
+data/db/

Caddyfile

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+{$SITE_ADDRESS} {
+    @admin {
+        path /
+        path /configs/*
+        path /subscriptions/*
+    }
+
+    basicauth @admin {
+        {$ADMIN_USER} {$ADMIN_PASSWORD_HASH}
+    }
+
+    reverse_proxy app:8000
+}

caddy/entrypoint.sh

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+#!/bin/sh
+set -e
+
+HASH=$(caddy hash-password --plaintext "${ADMIN_PASSWORD:-changeme}")
+export ADMIN_PASSWORD_HASH="$HASH"
+
+if [ -n "${HOST_DOMAIN:-}" ]; then
+    export SITE_ADDRESS="$HOST_DOMAIN"
+else
+    export SITE_ADDRESS=":80"
+fi
+
+exec caddy run --config /etc/caddy/Caddyfile --adapter caddyfile

data/mihomo/config.yaml

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+external-controller: 0.0.0.0:9090
+mixed-port: 7890
+allow-lan: false

docker-compose.yml

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+networks:
+  proxy_net:
+    driver: bridge
+
+volumes:
+  caddy_data:
+  caddy_config:
+
+services:
+  mihomo:
+    image: ghcr.io/metacubex/mihomo:latest
+    volumes:
+      - ./data/mihomo:/root/.config/mihomo
+    networks:
+      - proxy_net
+    restart: unless-stopped
+    healthcheck:
+      test: ["CMD", "wget", "-q", "-O-", "http://localhost:9090/version"]
+      interval: 5s
+      timeout: 3s
+      retries: 12
+      start_period: 5s
+
+  app:
+    build: ./app
+    env_file: .env
+    volumes:
+      - ./data/mihomo:/data/mihomo
+      - ./data/db:/data/db
+    networks:
+      - proxy_net
+    restart: unless-stopped
+    depends_on:
+      mihomo:
+        condition: service_healthy
+
+  caddy:
+    image: caddy:2-alpine
+    ports:
+      - "80:80"
+      - "443:443"
+      - "443:443/udp"
+    volumes:
+      - ./Caddyfile:/etc/caddy/Caddyfile:ro
+      - ./caddy/entrypoint.sh:/entrypoint.sh:ro
+      - caddy_data:/data
+      - caddy_config:/config
+    entrypoint: ["/bin/sh", "/entrypoint.sh"]
+    env_file: .env
+    networks:
+      - proxy_net
+    restart: unless-stopped
+    depends_on:
+      - app