[codex] fix reported workflow and UI bugs

[zhonggang666]

What this PR does / why we need it?

Fixes five reported bugs across application routing, dependency markers, icon URL handling, and workflow media nodes.

Closes #6367.
Closes #6368.
Closes #6369.
Closes #6370.
Closes #6371.

Summary of your change

• Fixed the malformed application chat-log fallback route.
• Corrected the Windows torch uv source marker from sys_platform == 'win' to sys_platform == 'win32'.
• Fixed defaultIcon so window.MaxKB.prefix is interpolated instead of treated as a literal string.
• Added explicit timeouts and HTTP status checks when generated media nodes download remote image/video URLs.
• Fixed generated media history replay so { file_id, url } metadata dictionaries are converted back into actual image URLs.

Please indicate you've done the following:

• Made sure tests are passing and test coverage is added if needed.
• Made sure commit message follow the rule of Conventional Commits specification.
• Considered the docs impact and opened a new docs issue or PR with docs changes if needed.

Validation:

• python -m py_compile apps/application/flow/step_node/image_generate_step_node/impl/base_image_generate_node.py apps/application/flow/step_node/text_to_video_step_node/impl/base_text_to_video_node.py apps/application/flow/step_node/image_to_video_step_node/impl/base_image_to_video_node.py
• git diff --check
• Verified the Windows packaging marker with packaging.markers.Marker.

Note: Frontend type-check was not run because this checkout does not include ui/node_modules or a frontend lockfile.