chore(apple): Xcode 27 project upgrade + hardened runtime

Applied via Xcode's recommended-settings upgrade and distribution prep:
- LastUpgradeCheck / scheme LastUpgradeVersion 2650 -> 2700.
- DEVELOPMENT_TEAM (F4H37KF6WC) hoisted to the project-level build configs; the
  now-redundant per-target copies are dropped (all targets inherit it).
- ENABLE_HARDENED_RUNTIME = YES on the macOS app target (required for Developer ID
  notarization). Signing stays Apple Development + Config/Punktfunk.entitlements.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

clients/apple/Punktfunk.xcodeproj/project.pbxproj

@@ -163,7 +163,7 @@
 			isa = PBXProject;
 			attributes = {
 				BuildIndependentTargetsInParallel = 1;
-				LastUpgradeCheck = 2650;
+				LastUpgradeCheck = 2700;
 				TargetAttributes = {
 					AA0000000000000000000009 = {
 						CreatedOnToolsVersion = 26.0;
@@ -272,6 +272,7 @@
 				COPY_PHASE_STRIP = NO;
 				DEAD_CODE_STRIPPING = YES;
 				DEBUG_INFORMATION_FORMAT = dwarf;
+				DEVELOPMENT_TEAM = F4H37KF6WC;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				ENABLE_TESTABILITY = YES;
 				ENABLE_USER_SCRIPT_SANDBOXING = YES;
@@ -328,6 +329,7 @@
 				COPY_PHASE_STRIP = NO;
 				DEAD_CODE_STRIPPING = YES;
 				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
+				DEVELOPMENT_TEAM = F4H37KF6WC;
 				ENABLE_NS_ASSERTIONS = NO;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				ENABLE_USER_SCRIPT_SANDBOXING = YES;
@@ -359,7 +361,7 @@
 				COMBINE_HIDPI_IMAGES = YES;
 				CURRENT_PROJECT_VERSION = 1;
 				DEAD_CODE_STRIPPING = YES;
-				DEVELOPMENT_TEAM = F4H37KF6WC;
+				ENABLE_HARDENED_RUNTIME = YES;
 				GENERATE_INFOPLIST_FILE = YES;
 				INFOPLIST_FILE = Config/Info.plist;
 				INFOPLIST_KEY_CFBundleDisplayName = "Punktfunkempfänger";
@@ -393,7 +395,7 @@
 				COMBINE_HIDPI_IMAGES = YES;
 				CURRENT_PROJECT_VERSION = 1;
 				DEAD_CODE_STRIPPING = YES;
-				DEVELOPMENT_TEAM = F4H37KF6WC;
+				ENABLE_HARDENED_RUNTIME = YES;
 				GENERATE_INFOPLIST_FILE = YES;
 				INFOPLIST_FILE = Config/Info.plist;
 				INFOPLIST_KEY_CFBundleDisplayName = "Punktfunkempfänger";
@@ -424,7 +426,6 @@
 				CODE_SIGN_ENTITLEMENTS = Config/Punktfunk.entitlements;
 				CODE_SIGN_STYLE = Automatic;
 				CURRENT_PROJECT_VERSION = 1;
-				DEVELOPMENT_TEAM = F4H37KF6WC;
 				GENERATE_INFOPLIST_FILE = YES;
 				INFOPLIST_FILE = Config/Info.plist;
 				INFOPLIST_KEY_CFBundleDisplayName = "Punktfunkempfänger";
@@ -463,7 +464,6 @@
 				CODE_SIGN_ENTITLEMENTS = Config/Punktfunk.entitlements;
 				CODE_SIGN_STYLE = Automatic;
 				CURRENT_PROJECT_VERSION = 1;
-				DEVELOPMENT_TEAM = F4H37KF6WC;
 				GENERATE_INFOPLIST_FILE = YES;
 				INFOPLIST_FILE = Config/Info.plist;
 				INFOPLIST_KEY_CFBundleDisplayName = "Punktfunkempfänger";
@@ -501,7 +501,6 @@
 				CODE_SIGN_ENTITLEMENTS = Config/Punktfunk.entitlements;
 				CODE_SIGN_STYLE = Automatic;
 				CURRENT_PROJECT_VERSION = 1;
-				DEVELOPMENT_TEAM = F4H37KF6WC;
 				GENERATE_INFOPLIST_FILE = YES;
 				INFOPLIST_FILE = Config/Info.plist;
 				INFOPLIST_KEY_CFBundleDisplayName = "Punktfunkempfänger";
@@ -531,7 +530,6 @@
 				CODE_SIGN_ENTITLEMENTS = Config/Punktfunk.entitlements;
 				CODE_SIGN_STYLE = Automatic;
 				CURRENT_PROJECT_VERSION = 1;
-				DEVELOPMENT_TEAM = F4H37KF6WC;
 				GENERATE_INFOPLIST_FILE = YES;
 				INFOPLIST_FILE = Config/Info.plist;
 				INFOPLIST_KEY_CFBundleDisplayName = "Punktfunkempfänger";

clients/apple/Punktfunk.xcodeproj/xcshareddata/xcschemes/Punktfunk-iOS.xcscheme

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "2650"
+   LastUpgradeVersion = "2700"
    version = "1.7">
    <BuildAction
       parallelizeBuildables = "YES"

clients/apple/Punktfunk.xcodeproj/xcshareddata/xcschemes/Punktfunk-tvOS.xcscheme

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "2650"
+   LastUpgradeVersion = "2700"
    version = "1.7">
    <BuildAction
       parallelizeBuildables = "YES"

clients/apple/Punktfunk.xcodeproj/xcshareddata/xcschemes/Punktfunk.xcscheme

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "2650"
+   LastUpgradeVersion = "2700"
    version = "1.7">
    <BuildAction
       parallelizeBuildables = "YES"