chore: initial project structure

internal/admin/admin.go

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+// package admin implements admin panel endpoints (modpack management, CI/CD release).
+package admin

internal/api/api.go

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+// Package api implements public HTTP endpoints for the launcher and website.
+package api
+

internal/auth/auth.go

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+// Package auth implements Yggdrasil authentication protocol.
+package auth

internal/cas/cas.go

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+// package cas implements Content-Addressable Storage for files (mods, assets, etc).
+package cas

internal/config/config.go

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+// package config handles server configuration (env vars, config files).
+package config

internal/database/database.go

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+// package database manages PostgreSQL connections, migrations, and data models.
+package database

internal/middleware/middleware.go

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+// package middleware provides HTTP middleware (JWT, CORS, rate limiting, logging).
+package middleware

internal/templates/templates.go

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+// package templates handles Go html/template rendering for the site and admin panel.
+package templates