Use --non-interactive flag for apps:create commands to prevent blocking coding agents

### Describe the problem
When coding agents (e.g., Gemini, Claude Code, Antigravity, etc.) execute the Firebase CLI command to register an iOS application:

```bash
npx -y firebase-tools@latest apps:create IOS
```

If the optional `--app-store-id` flag is not provided, the CLI prompts for it interactively:
```text
? App Store ID (optional)
```

Because coding agents typically execute commands in non-interactive shell environments, this interactive prompt blocks the agent's progress indefinitely. Similar interactive prompts can occur with Android/Web app creation or project creation commands if optional/required parameters are omitted.

### Proposed Solution
Ensure all documentation, CLI setup commands, and guides in this repository append the `--non-interactive` flag to `apps:create` commands (and potentially other CLI commands that can prompt interactively).

For example:
```bash
npx -y firebase-tools@latest apps:create IOS --non-interactive
```

This tells the CLI to skip optional interactive prompts and fail immediately if any required options are missing, rather than blocking the agent.