chore: move gateway default port from 4000 to 14242 (#375)

docs/guides/user-guide.md

@@ -16,7 +16,7 @@
 ### Prerequisites
 
 Mosaic Stack requires a running gateway. Your administrator provides the URL
-(default: `http://localhost:4000`) and creates your account.
+(default: `http://localhost:14242`) and creates your account.
 
 ### Logging In (Web)
 
@@ -177,7 +177,7 @@ mosaic --help
 ### Signing In
 
 ```bash
-mosaic login --gateway http://localhost:4000 --email you@example.com
+mosaic login --gateway http://localhost:14242 --email you@example.com
 ```
 
 You are prompted for a password if `--password` is not supplied. The session
@@ -191,12 +191,12 @@ mosaic tui
 
 Options:
 
-| Flag                    | Default                 | Description                        |
-| ----------------------- | ----------------------- | ---------------------------------- |
-| `--gateway <url>`       | `http://localhost:4000` | Gateway URL                        |
-| `--conversation <id>`   | —                       | Resume a specific conversation     |
-| `--model <modelId>`     | server default          | Model to use (e.g. `llama3.2`)     |
-| `--provider <provider>` | server default          | Provider (e.g. `ollama`, `openai`) |
+| Flag                    | Default                  | Description                        |
+| ----------------------- | ------------------------ | ---------------------------------- |
+| `--gateway <url>`       | `http://localhost:14242` | Gateway URL                        |
+| `--conversation <id>`   | —                        | Resume a specific conversation     |
+| `--model <modelId>`     | server default           | Model to use (e.g. `llama3.2`)     |
+| `--provider <provider>` | server default           | Provider (e.g. `ollama`, `openai`) |
 
 If no valid session exists you are prompted to sign in before the TUI launches.