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

README.md

@@ -37,20 +37,28 @@ NVCurve brings MSI Afterburner-style per-point voltage-frequency curve control t
 - **[uv](https://docs.astral.sh/uv/)** — Python package manager
 - **Root/sudo access** (required for GPU hardware interactions)
 
-## Installation from Source
+## Installation
+
+### One-liner
 
 ```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 repo, and installs NVCurve — the React frontend is compiled automatically during the build.
+
+### From a clone
+
+```bash
+git clone https://gitea.zephyre.one/Pakobbix/nvcurve.git
 cd nvcurve
+./install.sh
+```
 
-# Build the React frontend
-cd frontend
-npm install
-npm run build
-cd ..
+### Direct from git (no clone, no script)
 
-# Install the Python package (includes bundled frontend)
-uv tool install .
+```bash
+uv tool install "git+https://gitea.zephyre.one/Pakobbix/nvcurve.git"
 ```
 
 After installation, verify hardware compatibility:
@@ -200,10 +208,11 @@ The GPU key can be a UUID, `pci:XXXX`, or `idx:N` fallback. Find your GPU key wi
 ```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