feat(07-01): create config/ folder and YAML example files

- Added backend.yaml.example with AI, DB, auth, and logging schema
- Added frontend.yaml.example with API and feature flag schema
- Added network.yaml.example with ports and SSL schema
- Added docker.yaml.example with resource and volume schema
- Added secrets.yaml.example as a template for sensitive data
- All files include comprehensive comments documenting every variable

config/secrets.yaml.example

@@ -0,0 +1,34 @@
+# =============================================================================
+# TFM aInventory - Secrets Configuration Template (v1.12.0)
+# =============================================================================
+# Purpose: Sensitive configuration (API keys, passwords, secret keys).
+# Security: 'config/secrets.yaml' is ignored by Git. Do NOT commit actual secrets.
+# Setup: Copy this file to 'config/secrets.yaml' and fill in actual values.
+# =============================================================================
+
+# --- JWT Secrets ---
+# Secret key used for signing JSON Web Tokens.
+# Generate a strong random key for production use:
+#   python3 -c "import secrets; print(secrets.token_urlsafe(64))"
+# Environment override: BACKEND_AUTH_JWT_SECRET_KEY or JWT_SECRET_KEY
+JWT_SECRET_KEY: "CHANGE_ME_IN_PRODUCTION_MIN_32_CHARS"
+
+# --- AI API Keys ---
+# Google Gemini API Key (Required for AI image processing)
+# Get one at: https://aistudio.google.com/
+# Environment override: BACKEND_AI_GEMINI_API_KEY or GEMINI_API_KEY
+GEMINI_API_KEY: "your-gemini-api-key"
+
+# Anthropic Claude API Key (Required for fallback/enhanced processing)
+# Get one at: https://console.anthropic.com/
+# Environment override: BACKEND_AI_CLAUDE_API_KEY or CLAUDE_API_KEY
+CLAUDE_API_KEY: "your-claude-api-key"
+
+# --- External Services ---
+# Database password (if using an external DB instead of SQLite)
+# Environment override: BACKEND_DATABASE_PASSWORD
+DATABASE_PASSWORD: ""
+
+# LDAP password for the service account
+# Environment override: BACKEND_AUTH_LDAP_PASSWORD
+LDAP_PASSWORD: ""