proto: move AI agent model into provider, add base_url

Move the model field from the top-level AIAgent message into the
OpenAI provider configuration where it belongs. Different providers
have different model naming schemes and requirements, so this makes
the schema cleaner and more extensible.

Also add an optional base_url field to OpenAI provider to support
OpenAI-compatible API endpoints beyond the default OpenAI API.

Changes:
- Moved model field into Provider.OpenAI message
- Added base_url field to Provider.OpenAI message
- Updated AIAgentCreate and AIAgentUpdate messages accordingly
- Regenerated all protobuf code and OpenAPI specs

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: birdayz

backend/pkg/protogen/redpanda/api/console/v1alpha1/shadowlink.pb.gw.go

@@ -4375,7 +4375,7 @@ paths:
         content:
           multipart/form-data:
             schema:
-              example: '{"name":"redact-orders", "input_topic_name":"orders", "output_topic_names":["orders-redacted"], "environment_variables":[{"key":"LOGGER_LEVEL", "value":"DEBUG"}]}'
+              example: '{"name":"redact-orders","input_topic_name":"orders","output_topic_names":["orders-redacted"],"environment_variables":[{"key":"LOGGER_LEVEL","value":"DEBUG"}]}'
               properties:
                 metadata:
                   $ref: '#/components/schemas/DeployTransformRequest'

backend/pkg/protogen/redpanda/api/dataplane/v1alpha3/ai_agent.pb.go

@@ -21,8 +21,6 @@ components:
             $ref: '#/components/schemas/AIAgent.MCPServer'
           description: Map of MCP servers that this AI agent can use.
           type: object
-        model:
-          type: string
         provider:
           $ref: '#/components/schemas/AIAgent.Provider'
         resources:
@@ -49,7 +47,6 @@ components:
         - display_name
         - system_prompt
         - provider
-        - model
         - service_account
       type: object
     AIAgent.MCPServer:
@@ -68,8 +65,13 @@ components:
       properties:
         api_key:
           type: string
+        base_url:
+          type: string
+        model:
+          type: string
       required:
         - api_key
+        - model
       type: object
     AIAgent.ServiceAccount:
       properties:
@@ -114,8 +116,6 @@ components:
             $ref: '#/components/schemas/AIAgent.MCPServer'
           description: Map of MCP servers that this AI agent can use.
           type: object
-        model:
-          type: string
         provider:
           $ref: '#/components/schemas/AIAgent.Provider'
         resources:
@@ -134,7 +134,6 @@ components:
         - display_name
         - system_prompt
         - provider
-        - model
         - service_account
       type: object
     AIAgentUpdate:
@@ -153,8 +152,6 @@ components:
             $ref: '#/components/schemas/AIAgent.MCPServer'
           description: Map of MCP servers that this AI agent can use.
           type: object
-        model:
-          type: string
         provider:
           $ref: '#/components/schemas/AIAgent.Provider'
         resources:

backend/pkg/protogen/redpanda/api/dataplane/v1alpha3/shadowlink.pb.gw.go

@@ -5608,7 +5608,7 @@ paths:
         content:
           multipart/form-data:
             schema:
-              example: '{"name":"redact-orders","input_topic_name":"orders","output_topic_names":["orders-redacted"],"environment_variables":[{"key":"LOGGER_LEVEL","value":"DEBUG"}]}'
+              example: '{"name":"redact-orders", "input_topic_name":"orders", "output_topic_names":["orders-redacted"], "environment_variables":[{"key":"LOGGER_LEVEL", "value":"DEBUG"}]}'
               properties:
                 metadata:
                   $ref: '#/components/schemas/DeployTransformRequest'