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/uv.lock

@@ -992,6 +992,7 @@ version = "0.1.0"
 source = { virtual = "logic" }
 dependencies = [
     { name = "alembic" },
+    { name = "boto3" },
     { name = "fastapi", extra = ["standard"] },
     { name = "psycopg", extra = ["binary"] },
     { name = "pydantic-settings" },
@@ -1001,6 +1002,7 @@ dependencies = [
 [package.metadata]
 requires-dist = [
     { name = "alembic", specifier = ">=1.16.0" },
+    { name = "boto3", specifier = ">=1.38.23" },
     { name = "fastapi", extras = ["standard"], specifier = ">=0.115.12" },
     { name = "psycopg", extras = ["binary"], specifier = ">=3.2.9" },
     { name = "pydantic-settings", specifier = ">=2.9.1" },