Introduce AppBridgeViewController, a CAPBridgeViewController subclass that
registers the app-local SharedImagePlugin from capacitorDidLoad(), where
the Capacitor bridge is guaranteed to exist. This is the first step toward
replacing AppDelegate's timed retry registration with a deterministic,
bridge-ready registration point.
Point the existing root bridge controller in Main.storyboard at
AppBridgeViewController (same VC id/scene; only the custom class changes)
and add the new file to the App target in project.pbxproj.
The existing AppDelegate registration and its retry loop are intentionally
left in place as a temporary safety net, so the plugin is now registered
from both sites during this phase. No diagnostics, retry logic, JS, or
Android code changed; plugin name ("SharedImage") and implementation are
unchanged.
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