Add connected library for Git modpack manifests

.codex/project.md

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+# Modrinth Plus
+
+Modrinth Plus is a fork of the official Modrinth monorepo focused on the
+desktop app. Its first custom feature is Connected Library: public Git-hosted
+modpack manifests that can install and update exported `.mrpack` releases.
+
+## Stack
+
+- Monorepo package manager: pnpm
+- Desktop app frontend: Vue
+- Desktop app shell: Tauri
+- Core app logic: Rust crate `theseus` in `packages/app-lib`
+- Local app storage: SQLite migrations in `packages/app-lib/migrations`
+- CI target: Gitea Actions runner
+
+## Connected Library Defaults
+
+- Supports public HTTPS raw manifest URLs and GitHub/GitLab/Gitea repo URLs.
+- Manifest filename is `modrinth-plus.json`.
+- Auto-update is disabled by default and can be enabled per connected pack.
+- Private repository auth, SSH, and token storage are out of scope for v1.
+
+## Verification
+
+Use the cheapest relevant checks first:
+
+```bash
+pnpm install
+pnpm --filter @modrinth/app-frontend run lint
+cargo fmt --check
+cargo clippy --package theseus
+```
+
+Full app packaging may require platform-specific Tauri dependencies.