Add single-command installation: install.sh, Makefile, frontend build hook

- hatch_build.py: custom hatchling build hook that compiles the React
  frontend (npm ci + build) when frontend/dist is missing or stale, so
  'uv tool install git+https://gitea.zephyre.one/Pakobbix/nvcurve.git'
  works as a single command
- install.sh: curl|bash installer (checks prerequisites, auto-installs uv,
  clones and installs)
- Makefile: dev targets (frontend, install, dev, test, clean)
- README/docs: document the one-liner, clone, and direct-git installs

docs/Installation.md

@@ -29,37 +29,45 @@ sudo pacman -S uv
 pip install uv
 ```
 
-## Installation from Source
+## Installation
 
-### Step 1: Clone the Repository
+### Option 1: One-liner (recommended)
 
 ```bash
-git clone <this-repo-url>.git
+curl -fsSL https://gitea.zephyre.one/Pakobbix/nvcurve/raw/branch/main/install.sh | bash
+```
+
+The script checks prerequisites (installs `uv` if missing), clones the repository, and installs NVCurve. The React frontend is compiled automatically during the build by a hatchling build hook (`hatch_build.py`).
+
+### Option 2: From a clone
+
+```bash
+git clone https://gitea.zephyre.one/Pakobbix/nvcurve.git
 cd nvcurve
+./install.sh
 ```
 
-### Step 2: Build the Frontend
-
-The frontend is a React + TypeScript + Vite application in the `frontend/` directory.
+Equivalent manual steps (what the script does):
 
 ```bash
-cd frontend
-npm install
-npm run build
-cd ..
+git clone https://gitea.zephyre.one/Pakobbix/nvcurve.git
+cd nvcurve
+uv tool install .   # frontend is built automatically if missing/stale
 ```
 
-This produces a `dist/` directory with the compiled static assets. The hatch build system bundles `frontend/dist` into the Python package.
-
-### Step 3: Install the Python Package
+### Option 3: Direct from git (no clone, no script)
 
 ```bash
-uv tool install .
+uv tool install "git+https://gitea.zephyre.one/Pakobbix/nvcurve.git"
 ```
 
-This installs `nvcurve` as a system-wide tool with the bundled frontend.
+To install a specific branch:
 
-### Step 4: Verify
+```bash
+uv tool install "git+https://gitea.zephyre.one/Pakobbix/nvcurve.git@<branch>"
+```
+
+### Verify
 
 ```bash
 nvcurve setup
@@ -94,10 +102,11 @@ nvcurve serve start
 ```bash
 cd nvcurve
 git pull
-cd frontend && npm run build && cd ..
-uv tool install .
+uv tool install --force .
 ```
 
+The frontend is rebuilt automatically if it is missing or older than the frontend sources. If you modified frontend code locally, run `make frontend` first (or `rm -rf frontend/dist`).
+
 If running as a systemd service:
 
 ```bash
@@ -116,7 +125,7 @@ source ~/.local/bin/env  # or wherever uv installed
 
 ### Frontend not loading in the web UI
 
-Verify that `frontend/dist` exists and contains built assets. If the directory is empty or missing, rebuild with `npm run build` and reinstall with `uv tool install .`.
+Verify that the installed package contains the frontend. If `frontend/dist` is empty or missing, rebuild with `make frontend` (or `cd frontend && npm ci && npm run build`) and reinstall with `uv tool install --force .`.
 
 ### NvAPI functions not found