Support normalized visual capture bridge metadata

[wenyue]

Summary

• teach visual capture bridge detection to read supportedKinds from normalized resource parameters
• keep existing support for top-level supportedKinds, payload supportedKinds, and list content
• add a regression test for dynamic resource content shaped like { "parameters": { "supportedKinds": [...] } }

Root cause

Some app-side MCP toolkit resources return supportedKinds as regular result parameters. The dynamic resource gateway normalizes those values into JSON content under parameters, so the visual capture bridge can fail to detect an installed app bridge even though permission_status and the underlying screenshot extension are available.

Validation

• dart format mcp_server_dart/lib/src/capabilities/visual_capture/visual_capture.dart mcp_server_dart/test/visual_capture_test.dart
• Could not run dart test test/visual_capture_test.dart on this checkout because current local Dart is 3.11.5 while main requires >=3.12.0 <4.0.0.

I also validated the same regression shape against the local v3.1.1 build workspace before opening this PR.

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