docs: add ai.enabled platform configuration and team type feature (#7321)

Co-authored-by: Ben Hardill <ben@flowforge.com>

Author: cstns

docs/admin/introduction.md

@@ -185,6 +185,9 @@ including what Instance Types are available and any limits that should be applie
  - **Tables**
 
     Provides a Team scoped shared SQL Relational Database (Requires specific configuration). More details [here](../user/ff-tables.md)
+ - **AI Features**
+
+    Global toggle for all AI functionality within the team. When disabled, all AI features below are unavailable regardless of their individual settings. Requires `ai.enabled: true` in the platform configuration.
  - **Assistant Inline Code Completion**
 
     Allows LLM assistance when writing Functions nodes (requires a token from FlowFuse Support and available to Enterprise License holders). More details [here](/docs/user/expert/)

docs/install/configuration.md

@@ -229,6 +229,12 @@ Option         | Description
 `broker.url`   | The full url to the platform broker. This is used by the platform and Node-RED instances to connect to the broker. For example: `mqtt://localhost:1883`.
 `broker.public_url` | If set, this is the url provided to Devices to connect to the broker with. When running in a Docker or K8S environment, this url should be the externally addressable url the broker is provided on. This could be via WebSockets, for example: `ws://example.com:1884`
 
+## AI Configuration
+
+Option         | Description
+---------------|--------------
+`ai.enabled`   | Enables all AI features on the platform. When set to `false`, all AI functionality is disabled regardless of individual feature configuration (assistant, expert, inline completions, snapshot descriptions). Default: `true`
+
 ## FF Tables
 
 Option         | Description