feat: Migrate Arbiter and Modpack Version Checker to monorepo

WHAT WAS DONE:
- Migrated Arbiter (discord-oauth-arbiter) code to services/arbiter/
- Migrated Modpack Version Checker code to services/modpack-version-checker/
- Created .env.example for Arbiter with all required environment variables
- Moved systemd service file to services/arbiter/deploy/
- Organized directory structure per Gemini monorepo recommendations

WHY:
- Consolidate all service code in one repository
- Prepare for Gemini code review (Panel v1.12 compatibility check)
- Enable service-prefixed Git tagging (arbiter-v2.1.0, modpack-v1.0.0)
- Support npm workspaces for shared dependencies

SERVICES MIGRATED:
1. Arbiter (Discord OAuth bot) - Originally written by Gemini + Claude
   - Full source code from ops-manual docs/implementation/
   - Created comprehensive .env.example
   - Ready for Panel v1.12 compatibility verification

2. Modpack Version Checker (Python CLI tool)
   - Full source code from ops-manual docs/tasks/
   - Written for Panel v1.11, needs Gemini review for v1.12
   - Never had code review before

STILL TODO:
- Whitelist Manager - Pull from Billing VPS (38.68.14.188)
  - Currently deployed and running
  - Needs Panel v1.12 API compatibility fix (Task #86)
  - Requires SSH access to pull code

NEXT STEPS:
- Gemini code review for Panel v1.12 API compatibility
- Create package.json for each service
- Test npm workspaces integration
- Deploy after verification

FILES:
- services/arbiter/ (25 new files, full application)
- services/modpack-version-checker/ (21 new files, full application)

Signed-off-by: The Golden Chronicler <claude@firefrostgaming.com>

services/modpack-version-checker/setup.py

@@ -0,0 +1,61 @@
+"""Package setup for Modpack Version Checker."""
+
+from pathlib import Path
+
+from setuptools import find_packages, setup
+
+long_description = (Path(__file__).parent / "docs" / "README.md").read_text(
+    encoding="utf-8"
+)
+
+setup(
+    name="modpack-version-checker",
+    version="1.0.0",
+    author="Firefrost Gaming",
+    author_email="support@firefrostgaming.com",
+    description="Monitor CurseForge modpack versions and get notified of updates",
+    long_description=long_description,
+    long_description_content_type="text/markdown",
+    url="https://firefrostgaming.com",
+    license="MIT",
+    packages=find_packages(where="src"),
+    package_dir={"": "src"},
+    python_requires=">=3.9",
+    install_requires=[
+        "requests>=2.28.0",
+        "click>=8.1.0",
+        "rich>=13.0.0",
+        "pydantic>=2.0.0",
+        "sqlalchemy>=2.0.0",
+    ],
+    extras_require={
+        "scheduler": ["apscheduler>=3.10.0"],
+        "dev": [
+            "pytest>=7.0.0",
+            "pytest-cov>=4.0.0",
+            "pytest-mock>=3.10.0",
+            "responses>=0.23.0",
+            "black>=23.0.0",
+        ],
+    },
+    entry_points={
+        "console_scripts": [
+            "modpack-checker=modpack_checker.cli:main",
+        ],
+    },
+    classifiers=[
+        "Development Status :: 5 - Production/Stable",
+        "Environment :: Console",
+        "Intended Audience :: System Administrators",
+        "License :: OSI Approved :: MIT License",
+        "Operating System :: OS Independent",
+        "Programming Language :: Python :: 3",
+        "Programming Language :: Python :: 3.9",
+        "Programming Language :: Python :: 3.10",
+        "Programming Language :: Python :: 3.11",
+        "Programming Language :: Python :: 3.12",
+        "Topic :: Games/Entertainment",
+        "Topic :: System :: Monitoring",
+    ],
+    keywords="minecraft modpack curseforge version checker monitor",
+)