feat: migrate to Poetry and implement multi-backend DNS management ✨

- Migrated from setuptools to Poetry; added pyproject.toml, poetry.lock,
  poetry.toml and .python-version (Python 3.11.12)
- Built out full directdnsonly Python package with BIND and CoreDNS MySQL
  backends, CherryPy REST API, persist-queue worker, and vyper-based config
- Auth credentials now read from config/env (app.auth_username/password)
  rather than hardcoded; override via DADNS_APP_AUTH_PASSWORD env var
- Added Dockerfile.deepseek: Python 3.11 slim + BIND9 + Poetry install
- Rewrote docker-compose.yml for local dev stack (MySQL + dadns services)
- Added SQL schema, docker/ BIND configs, justfile, tests, and README
- Expanded .gitignore for Poetry/Python project artifacts

config/app.yml

@@ -0,0 +1,29 @@
+---
+timezone: Pacific/Auckland
+log_level: INFO
+queue_location: ./data/queues
+
+dns:
+  # default_backend: coredns_mysql
+  backends:
+    bind_backend:
+      type: bind
+      enabled: false
+      zones_dir: /etc/named/zones/dadns
+      named_conf: /etc/bind/named.conf.local
+    coredns_primary:
+      enabled: true
+      host: "mysql"  # Matches Docker service name
+      port: 3306
+      database: "coredns"
+      username: "coredns"
+      password: "coredns123"
+      table_name: "records"
+    coredns_secondary:
+      enabled: false
+      host: "mysql"  # Matches Docker service name
+      port: 3306
+      database: "coredns"
+      username: "coredns"
+      password: "coredns123"
+      table_name: "records"