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>

tools/today/collect.sh

@@ -11,7 +11,7 @@ set -euo pipefail
 
 SINCE="${FAI_TODAY_SINCE:-24 hours ago}"
 
-# Walk every fai-* directory next to fai_studio so the collector
+# Walk every fai-* directory next to chain_studio so the collector
 # works from any of the sibling checkouts. Adjust here if the
 # layout ever changes.
 ROOT="$(cd "$(dirname "$0")/../../.." && pwd)"
@@ -55,7 +55,7 @@ if [ -d "$arch_dir" ] && [ -d "$ROOT/fai_platform/.git" ]; then
 fi
 
 emit_section "STUDIO RECENT RELEASES"
-studio="$ROOT/fai_studio"
+studio="$ROOT/chain_studio"
 if [ -d "$studio/.git" ]; then
   tags=$(git -C "$studio" log --since="$SINCE" --pretty='%h %s' \
     --grep='^feat(studio)\|^chore(studio): bump' 2>/dev/null || true)