docs: add source install instructions and systemd service guide

- Replace PyPI-only install with full source build workflow (npm + uv)
- Add Blackwell GPU fork notice with extended memory offset and fan control
- Add systemd service section: install commands, unit file template, config reference
- Update docs/Installation.md to match npm + uv tool install . workflow
- Update docs/Overview.md with Blackwell-specific capabilities

docs/Overview.md

@@ -16,6 +16,8 @@ NVCurve provides two ways to interact with your GPU:
 ## Key Capabilities
 
 - **Per-Point Curve Editing** — Adjust the frequency offset for any individual voltage point on the V/F curve.
+- **Extended Memory Offset** — Memory clock offset up to +3000 MHz (Blackwell GPUs). Standard NVCurve caps at +1000 MHz.
+- **Fan Curve Control** — Custom temperature-to-fan-speed curves via NVML, adjustable through the web UI and savable in profiles.
 - **Curve Flattening** — Select multiple points and flatten them to a common frequency using anchor-point targeting.
 - **Live Monitoring** — Track GPU voltage, clock speed, temperature, and power draw in real time via NvAPI and NVML.
 - **Profile Management** — Save, load, and switch between named profiles. Set a default profile that auto-applies on startup.