feat: update model query to include default models in accessible models

KKP-695 | feat: update query in get_default_model_ids to filter by default_model

fix: simplify query for accessible models in ModelService

KKP-564 | feat: add KK_CREATIVE_USER role to user roles and update access permissions for tasklists and models

feat: include finetune_id in model access queries for enhanced model retrieval

feat: enhance user model access handling and improve error logging

refactor: streamline credit calculation in model service

feat: update model access handling to return string IDs for user permissions

feat: enhance model retrieval logic to include user-specific access permissions

refactor: enhance credit estimation models and service integration

refactor: a hell lot of refactor

feat: add method to retrieve credit to price conversion and update credits calculation in ModelService

fix: set default media format to 'jpg' in A2iImageService and correct model payload type in CreditsService

refactor: refactor credit estimation logic to use A2iImageGenerationRequest and remove DynamicPricingModels

feat: update credit estimation logic to use GPTImage1CreditEstimationParams and remove unused imports

feat: update CreditsService to use async config retrieval and refactor model imports

feat: update model service to use DynamicPricingModels and refactor related imports

feat: remove unused models.py file from kittykat_agent

feat: refactor credit estimation logic in ModelService and update API endpoint

feat: add credit service file

feat: add model service and API endpoints for model retrieval and credit estimation