refactor: rename app fai_studio -> chain_studio

Studio is the Ch∆In product's GUI, not a F∆I-vendor app. Rename the
Flutter package, all package: imports, and the build identity across
platforms: linux/windows CMake BINARY_NAME + project, Windows Runner.rc
fields, macOS PRODUCT_NAME / bundle id (ai.flemming.chain.chainStudio) /
.app + scheme BuildableName. Update the client-SDK + flow-editor deps to
their renamed chain_* packages (path + git URL). Company/copyright fields
now read Flemming.AI. flutter analyze: clean.

Signed-off-by: flemming-it <stefan.a.flemming@googlemail.com>

pubspec.lock

@@ -33,6 +33,20 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.1.2"
+  chain_client_sdk:
+    dependency: "direct main"
+    description:
+      path: "../fai_chain_client_sdk_dart"
+      relative: true
+    source: path
+    version: "0.18.0"
+  chain_studio_flow_editor:
+    dependency: "direct main"
+    description:
+      path: "../fai_chain_studio_flow_editor"
+      relative: true
+    source: path
+    version: "0.21.0"
   characters:
     dependency: transitive
     description:
@@ -105,20 +119,6 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.0.8"
-  fai_client_sdk:
-    dependency: "direct main"
-    description:
-      path: "../fai_client_sdk_dart"
-      relative: true
-    source: path
-    version: "0.18.0"
-  fai_studio_flow_editor:
-    dependency: "direct main"
-    description:
-      path: "../fai_studio_flow_editor"
-      relative: true
-    source: path
-    version: "0.21.0"
   fake_async:
     dependency: transitive
     description: