feat: add Containerfile and podman-compose setup

Host network mode for direct access to SOCKS5 proxy on localhost.
Config volume mounted from ./config. Makefile targets: build, up,
down, logs.

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

compose.yaml

@@ -0,0 +1,11 @@
+services:
+  bouncer:
+    build:
+      context: .
+      dockerfile: Containerfile
+    container_name: bouncer
+    restart: unless-stopped
+    network_mode: host
+    volumes:
+      - ./config:/data:Z
+    command: ["-c", "/data/bouncer.toml", "-v"]