feat(ipad): T-iPad-1 — device family [1,2] + iPad orientations + CI leg

Opens WebTerm to iPhone + iPad: TARGETED_DEVICE_FAMILY 1→1,2 (project + all
targets), iPad gets all four orientations (~ipad key), ios.yml gains an
ipad-tests leg (iPad Pro 11 sim). Built plist verified UIDeviceFamily [1,2];
app launches natively full-screen on iPad Pro 11 sim (no letterbox). Adaptive
layout (NavigationSplitView) lands in T-iPad-2. Plan: docs/PLAN_IOS_IPAD.md.

ios/project.yml

@@ -19,7 +19,7 @@ settings:
     SWIFT_VERSION: "6.0"                  # Swift 6 language mode
     SWIFT_STRICT_CONCURRENCY: complete
     IPHONEOS_DEPLOYMENT_TARGET: "17.0"
-    TARGETED_DEVICE_FAMILY: "1"           # iPhone only (iPad layout is out of v1 scope)
+    TARGETED_DEVICE_FAMILY: "1,2"        # iPhone + iPad (T-iPad-1; adaptive layout)
     CODE_SIGN_STYLE: Automatic
 
 packages:
@@ -55,9 +55,10 @@ targets:
       base:
         PRODUCT_BUNDLE_IDENTIFIER: com.yaojia.webterm
         # Target-level on purpose (T-iOS-19 finding): XcodeGen's target platform
-        # default ("1,2") overrides a project-level value, shipping an
-        # installable-but-untested iPad layout. Target-level wins.
-        TARGETED_DEVICE_FAMILY: "1"
+        # default overrides a project-level value. iPad adaptation (T-iPad-1)
+        # opens this to iPhone + iPad; the adaptive layout (LayoutPolicy /
+        # NavigationSplitView, T-iPad-2) makes the iPad layout first-class.
+        TARGETED_DEVICE_FAMILY: "1,2"
     info:
       path: App/WebTerm/Resources/Info.plist
       properties:
@@ -69,10 +70,18 @@ targets:
         CFBundleURLTypes:
           - CFBundleURLName: com.yaojia.webterm.deeplink
             CFBundleURLSchemes: [webterminal]
+        # iPhone: portrait + both landscapes (no upside-down — matches P0).
         UISupportedInterfaceOrientations:
           - UIInterfaceOrientationPortrait
           - UIInterfaceOrientationLandscapeLeft
           - UIInterfaceOrientationLandscapeRight
+        # iPad (T-iPad-1): all four orientations — iPad users hold it any way,
+        # and Split View / Stage Manager assume full orientation freedom.
+        UISupportedInterfaceOrientations~ipad:
+          - UIInterfaceOrientationPortrait
+          - UIInterfaceOrientationPortraitUpsideDown
+          - UIInterfaceOrientationLandscapeLeft
+          - UIInterfaceOrientationLandscapeRight
         # ── Security-critical keys, transcribed verbatim from PLAN_IOS_CLIENT §5.2 ──
         # NO NSAllowsArbitraryLoads anywhere (release OR debug): the five CIDR
         # exceptions below cover LAN + hotspot + Tailscale CGNAT + simulator
@@ -114,7 +123,7 @@ targets:
     settings:
       base:
         GENERATE_INFOPLIST_FILE: true
-        TARGETED_DEVICE_FAMILY: "1"
+        TARGETED_DEVICE_FAMILY: "1,2"
         TEST_HOST: "$(BUILT_PRODUCTS_DIR)/WebTerm.app/$(BUNDLE_EXECUTABLE_FOLDER_PATH)/WebTerm"
         BUNDLE_LOADER: "$(TEST_HOST)"
 
@@ -131,7 +140,7 @@ targets:
     settings:
       base:
         GENERATE_INFOPLIST_FILE: true
-        TARGETED_DEVICE_FAMILY: "1"
+        TARGETED_DEVICE_FAMILY: "1,2"
         TEST_TARGET_NAME: WebTerm
 
 schemes: