fix(cli): resolve Nx hooks from package directories

[fzlzjerry]

What does this PR do?

Fixes #8538.

Hook lookup now checks the package at the directory passed to runPlatformHook before considering the Nx workspace root. This lets an app and each plugin run the hook declared in their own package.json and with their own working directory.

The Nx-root behavior is retained as a fallback for integrated workspaces where the app has no local package or hook. Plugin lookups explicitly disable that fallback so a workspace-root hook is not run once for every installed plugin.

Regression tests cover:

• app and plugin hooks taking precedence over the Nx-root hook;
• the Nx-root fallback for an app without a local package; and
• plugins without a hook not inheriting the Nx-root hook.

Testing

• npm test --workspace @capacitor/cli (13 suites, 87 tests)
• npm run build --workspace @capacitor/cli
• npm run eslint (0 errors; 7 warnings in unchanged tests)
• npm run prettier -- --check

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