fix: restore credential wiring in AGUI GoogleADK template

The template was missing load_model() call and bedrock-agentcore dep,
so GOOGLE_API_KEY was never set from the AgentCore credential. Both
dev mode and deployed agents failed with "No API key provided."

Author: aidandaly24

src/assets/__tests__/__snapshots__/assets.snapshot.test.ts.snap

@@ -2009,9 +2009,13 @@ Thumbs.db
 `;
 
 exports[`Assets Directory Snapshots > Python framework assets > python/python/agui/googleadk/base/main.py should match snapshot 1`] = `
-"import uvicorn
+"import os
+import uvicorn
 from google.adk.agents import LlmAgent
 from ag_ui_adk import ADKAgent, AGUIToolset, create_adk_app
+from model.load import load_model
+
+load_model()
 
 agent = LlmAgent(
     name="{{ name }}",
@@ -2103,6 +2107,7 @@ requires-python = ">=3.10"
 dependencies = [
     "ag-ui-adk >= 0.6.0",
     "ag-ui-protocol >= 0.1.10",
+    "bedrock-agentcore >= 1.0.3",
     "fastapi >= 0.115.12",
     "google-adk >= 1.16.0",
     "google-genai >= 1.0.0",

src/assets/python/agui/googleadk/base/main.py

@@ -1,6 +1,10 @@
+import os
 import uvicorn
 from google.adk.agents import LlmAgent
 from ag_ui_adk import ADKAgent, AGUIToolset, create_adk_app
+from model.load import load_model
+
+load_model()
 
 agent = LlmAgent(
     name="{{ name }}",

src/assets/python/agui/googleadk/base/pyproject.toml

@@ -11,6 +11,7 @@ requires-python = ">=3.10"
 dependencies = [
     "ag-ui-adk >= 0.6.0",
     "ag-ui-protocol >= 0.1.10",
+    "bedrock-agentcore >= 1.0.3",
     "fastapi >= 0.115.12",
     "google-adk >= 1.16.0",
     "google-genai >= 1.0.0",