feat: add vicinae-extensions and update vicinae settings

Add vicinae-extensions flake input and configure extensions (bluetooth,
nix, power-profile). Move vicinae cache config from system.nix to
cachix.nix. Update vicinae settings to new config schema with systemd
autostart.

Co-Authored-By: Claude Sonnet 4.6 <[email protected]>

flake.lock

@@ -147,6 +147,22 @@
         "type": "github"
       }
     },
+    "flake-compat_4": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1767039857,
+        "narHash": "sha256-vNpUSpF5Nuw8xvDLj2KCwwksIbjua2LZCqhV1LNRDns=",
+        "owner": "NixOS",
+        "repo": "flake-compat",
+        "rev": "5edf11c44bc78a0d334f6334cdaf7d60d732daab",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "repo": "flake-compat",
+        "type": "github"
+      }
+    },
     "flake-parts": {
       "inputs": {
         "nixpkgs-lib": [
@@ -751,7 +767,8 @@
         "noctalia": "noctalia",
         "quickshell": "quickshell",
         "stylix": "stylix",
-        "vicinae": "vicinae"
+        "vicinae": "vicinae",
+        "vicinae-extensions": "vicinae-extensions"
       }
     },
     "rust-overlay": {
@@ -899,6 +916,21 @@
         "type": "github"
       }
     },
+    "systems_7": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    },
     "tinted-kitty": {
       "flake": false,
       "locked": {
@@ -1004,6 +1036,54 @@
         "type": "github"
       }
     },
+    "vicinae-extensions": {
+      "inputs": {
+        "flake-compat": "flake-compat_4",
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "systems": "systems_7",
+        "vicinae": "vicinae_2"
+      },
+      "locked": {
+        "lastModified": 1777597325,
+        "narHash": "sha256-LfqeVlMwclHJKsJu5jJoztjlaCeIasQsiv3P9+eKDNw=",
+        "owner": "vicinaehq",
+        "repo": "extensions",
+        "rev": "89cc49471c3e7119bfd36d68998cefe534bddab8",
+        "type": "github"
+      },
+      "original": {
+        "owner": "vicinaehq",
+        "repo": "extensions",
+        "type": "github"
+      }
+    },
+    "vicinae_2": {
+      "inputs": {
+        "nixpkgs": [
+          "vicinae-extensions",
+          "nixpkgs"
+        ],
+        "systems": [
+          "vicinae-extensions",
+          "systems"
+        ]
+      },
+      "locked": {
+        "lastModified": 1768856963,
+        "narHash": "sha256-u5bWDuwk6oieTnvm1YjNotcYK8iJSddH5+S68+X4TSc=",
+        "owner": "vicinaehq",
+        "repo": "vicinae",
+        "rev": "934bc0ad47be6dbd6498a0dac655c4613fd0ab27",
+        "type": "github"
+      },
+      "original": {
+        "owner": "vicinaehq",
+        "repo": "vicinae",
+        "type": "github"
+      }
+    },
     "xwayland-satellite-stable": {
       "flake": false,
       "locked": {