fix: Update MCP_URL to use default Kagenti service port 9090

The Kagenti UI defaults tool service ports to 9090 (since rossoctl/rossoctl#1175).
These .env files still referenced port 8000, causing connection failures when
agents tried to reach tools via the K8s service.

Assisted-By: Claude (Anthropic AI) <noreply@anthropic.com>
Signed-off-by: Hai Huang <huang195@gmail.com>

Author: huang195

a2a/git_issue_agent/.env.ollama

@@ -20,5 +20,5 @@ PORT=8000
 LOG_LEVEL=DEBUG
 
 # MCP Tool endpoint
-# Port 8000 is the default for Kagenti Tools
-MCP_URL=http://github-tool-mcp:8000/mcp
+# Port 9090 is the default Kagenti service port for tools
+MCP_URL=http://github-tool-mcp:9090/mcp

a2a/image_service/.env.openai

@@ -2,4 +2,4 @@ OPENAI_API_KEY='{"valueFrom": {"secretKeyRef": {"name": "openai-secret", "key":
 LLM_API_KEY='{"valueFrom": {"secretKeyRef": {"name": "openai-secret", "key": "apikey"}}}'
 LLM_API_BASE=https://api.openai.com/v1
 LLM_MODEL=gpt-4o-mini-2024-07-18
-MCP_URL=http://image-tool-mcp:8000/mcp
+MCP_URL=http://image-tool-mcp:9090/mcp

a2a/weather_service/.env.ollama

@@ -1,4 +1,4 @@
 LLM_API_BASE=http://host.docker.internal:11434/v1
 LLM_API_KEY=dummy
 LLM_MODEL=llama3.2:3b-instruct-fp16
-MCP_URL=http://weather-tool-mcp:8000/mcp
+MCP_URL=http://weather-tool-mcp:9090/mcp

a2a/weather_service/.env.openai

@@ -2,4 +2,4 @@ OPENAI_API_KEY='{"valueFrom": {"secretKeyRef": {"name": "openai-secret", "key":
 LLM_API_KEY='{"valueFrom": {"secretKeyRef": {"name": "openai-secret", "key": "apikey"}}}'
 LLM_API_BASE=https://api.openai.com/v1
 LLM_MODEL=gpt-4o-mini-2024-07-18
-MCP_URL=http://weather-tool-mcp:8000/mcp
+MCP_URL=http://weather-tool-mcp:9090/mcp