Encrypt sensitive credential fields before event bus emission (#215)

- Add encrypt_credential_dict() and decrypt_credential_field() to utils/crypto.py
- Create utils/credential_encryption.py with encryption/decryption helpers
- Add get_credential_encryption_key() to retrieve key from Infisical at runtime
- Add emit_credential_found() wrapper for modules to use instead of direct bus.emit()
- Update all 15 modules emitting CREDENTIAL_FOUND to use encrypted wrapper
- Update 4 modules consuming CREDENTIAL_FOUND to decrypt payload before processing
- Sensitive fields (username, password, hash, token, etc.) encrypted with AES-256-GCM
- Falls back to plaintext if encryption key unavailable or encryption fails

modules/active/bettercap_mgr.py

@@ -20,6 +20,7 @@ from typing import Optional
 
 from modules.base import BaseModule
 from utils.bettercap_api import BettercapAPI
+from utils.credential_encryption import emit_credential_found
 
 logger = logging.getLogger("sensor.active.bettercap_mgr")
 
@@ -477,7 +478,7 @@ class BettercapManager(BaseModule):
             "credential_value": data.get("password", data.get("hash", "")),
             "raw_data": data,
         }
-        self.bus.emit("CREDENTIAL_FOUND", payload, source_module=self.name)
+        emit_credential_found(self.bus, self.name, payload)
         logger.info(
             "Credential captured: %s@%s (%s)",
             payload["username"], payload["target_ip"], payload["target_service"],