Add boto3 dependency and update exercise/machine assets

- Added boto3 as a dependency in pyproject.toml and uv.lock.
- Introduced multiple new exercise images in various formats (jpg, webp, avif, png).
- Added new machine images to enhance the workout assets library.

services/logic/app/core.py

@@ -6,6 +6,13 @@ from pydantic_settings import BaseSettings, SettingsConfigDict
 class Settings(BaseSettings):
     database_url: str = "postgresql+psycopg://train_watcher:train_watcher@localhost:5432/train_watcher"
     service_token: str = "dev-service-token-change-me"
+    s3_endpoint_url: str = "http://localhost:9000"
+    s3_public_base_url: str = "http://localhost:9000"
+    s3_access_key_id: str = "minioadmin"
+    s3_secret_access_key: str = "minioadmin"
+    s3_bucket: str = "train-watcher-media"
+    s3_region: str = "us-east-1"
+    builtin_assets_dir: str = "/app/workout_assets"
 
     model_config = SettingsConfigDict(env_file=".env", extra="ignore")