Implement GuardDen Discord moderation bot

Features:
- Core moderation: warn, kick, ban, timeout, strike system
- Automod: banned words filter, scam detection, anti-spam, link filtering
- AI moderation: Claude/OpenAI integration, NSFW detection, phishing analysis
- Verification system: button, captcha, math, emoji challenges
- Rate limiting system with configurable scopes
- Event logging: joins, leaves, message edits/deletes, voice activity
- Per-guild configuration with caching
- Docker deployment support

Bug fixes applied:
- Fixed await on session.delete() in guild_config.py
- Fixed memory leak in AI moderation message tracking (use deque)
- Added error handling to bot shutdown
- Added error handling to timeout command
- Removed unused Literal import
- Added prefix validation
- Added image analysis limit (3 per message)
- Fixed test mock for SQLAlchemy model

pyproject.toml

@@ -0,0 +1,98 @@
+[build-system]
+requires = ["setuptools>=61.0", "wheel"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "guardden"
+version = "0.1.0"
+description = "A comprehensive Discord moderation bot with AI-powered content filtering"
+readme = "README.md"
+license = {text = "MIT"}
+requires-python = ">=3.11"
+authors = [
+    {name = "GuardDen Team"}
+]
+classifiers = [
+    "Development Status :: 3 - Alpha",
+    "Intended Audience :: Developers",
+    "License :: OSI Approved :: MIT License",
+    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
+]
+
+dependencies = [
+    "discord.py>=2.3.0",
+    "asyncpg>=0.29.0",
+    "pydantic>=2.5.0",
+    "pydantic-settings>=2.1.0",
+    "aiohttp>=3.9.0",
+    "python-dotenv>=1.0.0",
+    "alembic>=1.13.0",
+    "sqlalchemy>=2.0.0",
+]
+
+[project.optional-dependencies]
+dev = [
+    "pytest>=7.4.0",
+    "pytest-asyncio>=0.23.0",
+    "pytest-cov>=4.1.0",
+    "ruff>=0.1.0",
+    "mypy>=1.7.0",
+    "pre-commit>=3.6.0",
+]
+ai = [
+    "anthropic>=0.18.0",
+    "openai>=1.10.0",
+    "pillow>=10.2.0",
+]
+voice = [
+    "speechrecognition>=3.10.0",
+    "pydub>=0.25.0",
+]
+
+[project.scripts]
+guardden = "guardden.__main__:main"
+
+[tool.setuptools.packages.find]
+where = ["src"]
+
+[tool.ruff]
+target-version = "py311"
+line-length = 100
+src = ["src", "tests"]
+
+[tool.ruff.lint]
+select = [
+    "E",      # pycodestyle errors
+    "W",      # pycodestyle warnings
+    "F",      # Pyflakes
+    "I",      # isort
+    "B",      # flake8-bugbear
+    "C4",     # flake8-comprehensions
+    "UP",     # pyupgrade
+    "ARG",    # flake8-unused-arguments
+    "SIM",    # flake8-simplify
+]
+ignore = [
+    "E501",   # line too long (handled by formatter)
+    "B008",   # do not perform function calls in argument defaults
+]
+
+[tool.ruff.lint.isort]
+known-first-party = ["guardden"]
+
+[tool.pytest.ini_options]
+asyncio_mode = "auto"
+testpaths = ["tests"]
+addopts = "-v --tb=short"
+
+[tool.mypy]
+python_version = "3.11"
+strict = true
+warn_return_any = true
+warn_unused_ignores = true
+plugins = ["pydantic.mypy"]
+
+[[tool.mypy.overrides]]
+module = ["discord.*", "asyncpg.*"]
+ignore_missing_imports = true