scaffold Flutter Windows desktop target

Add the generated Windows runner tree and register the windows
platform in .metadata. The Flutter SDK revision bump that came with
`flutter create` for windows also re-resolved the transitive pins in
pubspec.lock. .gitignore now excludes the built clide-cli binary on
Windows, matching the existing linux/macos entries.

Co-Authored-By: Claude <noreply@anthropic.com>

pubspec.lock

@@ -5,10 +5,10 @@ packages:
     dependency: transitive
     description:
       name: _fe_analyzer_shared
-      sha256: "8d7ff3948166b8ec5da0fbb5962000926b8e02f2ed9b3e51d1738905fbd4c98d"
+      sha256: a49d6cf99e8d8e7a8e93668d09ced0bbdb954d0b4fccc2f5f9241c6b87fad95c
       url: "https://pub.dev"
     source: hosted
-    version: "93.0.0"
+    version: "99.0.0"
   alchemist:
     dependency: "direct dev"
     description:
@@ -21,10 +21,10 @@ packages:
     dependency: transitive
     description:
       name: analyzer
-      sha256: de7148ed2fcec579b19f122c1800933dfa028f6d9fd38a152b04b1516cec120b
+      sha256: "663efa951fb8a45e06f491223a604c93820598f20e6a99c25617a1576065e8b7"
       url: "https://pub.dev"
     source: hosted
-    version: "10.0.1"
+    version: "12.1.0"
   args:
     dependency: transitive
     description:
@@ -93,10 +93,10 @@ packages:
     dependency: transitive
     description:
       name: coverage
-      sha256: "5da775aa218eaf2151c721b16c01c7676fbfdd99cebba2bf64e8b807a28ff94d"
+      sha256: "956a3de0725ca232ad353565a8290d3357592bf4250f6f298a185e2d949c5d3d"
       url: "https://pub.dev"
     source: hosted
-    version: "1.15.0"
+    version: "1.15.1"
   crypto:
     dependency: transitive
     description:
@@ -555,10 +555,10 @@ packages:
     dependency: transitive
     description:
       name: vm_service
-      sha256: "046d3928e16fa4dc46e8350415661755ab759d9fc97fc21b5ab295f71e4f0499"
+      sha256: "0016aef94fc66495ac78af5859181e3f3bf2026bd8eecc72b9565601e19ab360"
       url: "https://pub.dev"
     source: hosted
-    version: "15.1.0"
+    version: "15.2.0"
   watcher:
     dependency: transitive
     description: