refactored: to utilise the google adk and production grade agent

.env.example

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+# GCP Solution Architecture Agent Environment Variables
+
+# Agent Identity & Server Config
+AGENT_NAME=gcp_solution_architecture_agent
+AGENT_VERSION=1.0.0
+LOG_LEVEL=INFO
+HOST=0.0.0.0
+PORT=8080
+
+# LLM Provider Configuration (OpenAI or Azure OpenAI)
+OPENAI_API_KEY=your-openai-api-key-here
+AZURE_OPENAI_API_KEY=your-azure-openai-api-key-here
+AZURE_OPENAI_ENDPOINT=https://your-resource.openai.azure.com/
+AZURE_OPENAI_DEPLOYMENT=gpt-4o
+AZURE_OPENAI_API_VERSION=2024-02-15-preview
+LLM_TEMPERATURE=0.2
+
+# Google Cloud Project & Scanner Credentials
+GOOGLE_APPLICATION_CREDENTIALS=/app/credentials/gcp-key.json
+GCP_PROJECT_ID=your-gcp-project-id
+GCP_REGION=us-central1
+
+# PostgreSQL Database & State Storage
+POSTGRES_HOST=localhost
+POSTGRES_PORT=5432
+POSTGRES_DB=gcp_agent_db
+POSTGRES_USER=postgres
+POSTGRES_PASSWORD=postgres
+# DATABASE_URL=postgresql://postgres:postgres@localhost:5432/gcp_agent_db
+SQLITE_FALLBACK_DB=gcp_agent_local.db
+
+# Google ADK Multi-Agent Settings
+ADK_MAX_LOOP_ITERATIONS=5
+ADK_ENABLE_ARTIFACT_STORE=true
+
+# Google Developer Knowledge MCP Integration
+DEVELOPER_KNOWLEDGE_MCP_URL=https://developerknowledge.googleapis.com/mcp
+DEVELOPER_KNOWLEDGE_MCP_ENABLED=true