Refactor configuration management; remove deprecated files and unify settings in YAML format

example.config.yaml

@@ -0,0 +1,50 @@
+# System Configuration
+mongo_uri: "mongodb://localhost:27017"
+database_name: "helia"
+
+# S3 Configuration (MinIO or AWS)
+s3_endpoint: "https://s3.amazonaws.com"
+s3_access_key: "your_access_key"
+s3_secret_key: "your_secret_key"
+s3_bucket: "your-bucket-name"
+s3_prefix: ""
+s3_region: "us-east-1"
+
+# Run Configuration
+limit: 5
+
+providers:
+  openai:
+    # Set api_key here or export OPENAI_API_KEY
+    api_base: "https://api.openai.com/v1"
+    api_format: "openai"
+
+  anthropic:
+    # Set api_key here or export ANTHROPIC_API_KEY
+    api_base: "https://api.anthropic.com/v1"
+    api_format: "anthropic"
+
+  openrouter:
+    # Set api_key here or export OPENROUTER_API_KEY
+    api_base: "https://openrouter.ai/api/v1"
+    api_format: "openai"
+
+  local_ollama:
+    # API key optional for local_* providers
+    api_base: "http://localhost:11434/v1"
+    api_format: "ollama"
+
+runs:
+  - run_name: "baseline_gpt4"
+    model:
+      provider: openai
+      model_name: "gpt-4o"
+      temperature: 0.0
+    prompt_id: "default"
+
+  - run_name: "test_llama3"
+    model:
+      provider: local_ollama
+      model_name: "llama3"
+      temperature: 0.7
+    prompt_id: "default"