feat: make AGS colorshell configuration fully declarative

- Add complete colorshell v2.0.3 configuration to home/ags-config/
- Disable runner plugin and NightLight tile (incompatible with NixOS)
- Customize SCSS with full opacity (no transparency)
- Add dark pale blue color scheme in home/pywal-colors/
- Configure Papirus-Dark icon theme via home-manager
- Make ~/.config/ags/ immutable and managed by Nix store
- Auto-deploy pywal colors to ~/.cache/wal/colors.json

All AGS configuration is now reproducible and version controlled.

home/ags-config/package.json

@@ -0,0 +1,20 @@
+{
+    "$schema": "https://www.schemastore.org/package.json",
+    "name": "colorshell",
+    "version": "2.0.3",
+    "packageManager": "pnpm@10.12.1",
+    "scripts": {
+        "types": "sh ./scripts/types.sh",
+        "dev": "sh ./scripts/build.sh -d && sh ./scripts/start.sh",
+        "start": "sh ./scripts/start.sh",
+        "clean": "sh ./scripts/clean.sh",
+        "build": "sh ./scripts/build.sh",
+        "build:release": "sh ./scripts/release.sh",
+        "sync-config": "sh ./scripts/sync-config.sh"
+    },
+    "devDependencies": {
+        "ags": "link:/usr/share/ags/js",
+        "gnim-utils": "github:retrozinndev/gnim-utils#1.0.0",
+        "fuse.js": "^7.1.0"
+    }
+}