fix: add default values to llm_analysis workflow parameters

Resolves validation error where agent_url was None when not explicitly provided. The TemporalManager applies defaults from metadata.yaml, not from module input schemas, so all parameters need defaults in the workflow metadata.

Changes:
- Add default agent_url, llm_model (gpt-5-mini), llm_provider (openai)
- Expand file_patterns to 45 comprehensive patterns covering code, configs, secrets, and Docker files
- Increase default limits: max_files (10), max_file_size (100KB), timeout (90s)

backend/toolbox/workflows/llm_analysis/metadata.yaml

@@ -19,26 +19,78 @@ parameters:
     agent_url:
       type: string
       description: "A2A agent endpoint URL"
+      default: "http://fuzzforge-task-agent:8000/a2a/litellm_agent"
     llm_model:
       type: string
       description: "LLM model to use (e.g., gpt-4o-mini, claude-3-5-sonnet)"
+      default: "gpt-5-mini"
     llm_provider:
       type: string
       description: "LLM provider (openai, anthropic, etc.)"
+      default: "openai"
     file_patterns:
       type: array
       items:
         type: string
-      description: "File patterns to analyze (e.g., ['*.py', '*.js'])"
+      default:
+        - "*.py"
+        - "*.js"
+        - "*.ts"
+        - "*.jsx"
+        - "*.tsx"
+        - "*.java"
+        - "*.go"
+        - "*.rs"
+        - "*.c"
+        - "*.cpp"
+        - "*.h"
+        - "*.hpp"
+        - "*.cs"
+        - "*.php"
+        - "*.rb"
+        - "*.swift"
+        - "*.kt"
+        - "*.scala"
+        - "*.env"
+        - "*.yaml"
+        - "*.yml"
+        - "*.json"
+        - "*.xml"
+        - "*.ini"
+        - "*.sql"
+        - "*.properties"
+        - "*.sh"
+        - "*.bat"
+        - "*.ps1"
+        - "*.config"
+        - "*.conf"
+        - "*.toml"
+        - "*id_rsa*"
+        - "*id_dsa*"
+        - "*id_ecdsa*"
+        - "*id_ed25519*"
+        - "*.pem"
+        - "*.key"
+        - "*.pub"
+        - "*.txt"
+        - "*.md"
+        - "Dockerfile"
+        - "docker-compose.yml"
+        - ".gitignore"
+        - ".dockerignore"
+      description: "File patterns to analyze for security issues and secrets"
     max_files:
       type: integer
       description: "Maximum number of files to analyze"
+      default: 10
     max_file_size:
       type: integer
       description: "Maximum file size in bytes"
+      default: 100000
     timeout:
       type: integer
       description: "Timeout per file in seconds"
+      default: 90
 
 output_schema:
   type: object