chore: update agent secrets when they are empty with local vars

[0xbbjoker]

Summary

Add automatic synchronization of secrets from local .env file for characters that don't have secrets configured.

Context

When characters are stored in the database or loaded from files, they often lack secrets for security reasons. However, agents need these secrets (API keys, tokens, etc.) to function properly. This change implements an automatic fallback mechanism.

Problem

• Characters stored without secrets fail to run properly
• Manual secret configuration was required for each character
• No standardized way to handle missing secrets

Solution

Implemented automatic secret synchronization that:

1. Checks if character has secrets configured
2. If not, loads secrets from local .env file
3. Applies them to character before runtime initialization

Technical Details

New Functions in config-utils.ts:

• hasCharacterSecrets(character) - Validates if secrets exist
• ensureCharacterSettings(character) - Ensures settings object exists
• loadLocalEnvSecrets() - Loads secrets from .env file
• setDefaultSecretsFromEnv(character) - Main sync function

Integration Point:

• Added to agent-start.ts before AgentRuntime creation
• Ensures secrets are available before any plugins initialize

Benefits

• Security: Secrets remain in .env files, not in stored characters
• Convenience: Characters work automatically with local environment
• Flexibility: Characters can be shared without exposing secrets
• Consistency: Single source of truth for secrets (local .env)

Testing

• Character without secrets → should load from .env
• Character with existing secrets → should keep original secrets
• No .env file → should handle gracefully

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