feat: add installer and keybinds

Automated installer with:
- Dry-run mode for previewing changes
- QML module deployment to ~/.config/quickshell/
- Script installation to ~/.local/share/hypr-lens/
- Optional Python venv setup for OpenCV
- Auto-integration into existing quickshell configs
- Uninstall support

Includes example Hyprland keybinds for all features.

keybinds.example.conf

@@ -0,0 +1,24 @@
+# hypr-lens keybinds
+# Copy these to your Hyprland keybinds config file
+# (e.g., ~/.config/hypr/keybinds.conf or your custom keybinds file)
+
+# Region screenshot (copy to clipboard)
+bind = Super+Shift, S, global, quickshell:regionScreenshot
+
+# Image search (Google Lens)
+bind = Super+Shift, A, global, quickshell:regionSearch
+
+# OCR text extraction
+bind = Super+Shift, X, global, quickshell:regionOcr
+
+# Region recording
+bind = Super+Shift, R, global, quickshell:regionRecord
+
+# Region recording with audio
+bind = Super+Shift+Alt, R, global, quickshell:regionRecordWithSound
+
+# Color picker (requires hyprpicker)
+bind = Super+Shift, C, exec, hyprpicker -a
+
+# Quick fullscreen screenshot
+bindl = , Print, exec, grim - | wl-copy