fix(aria2): resolve comfy_path via common.context in aria2_download_url

[ReinisLusis]

aria2_download_url in comfyui_manager/common/manager_downloader.py:79 does import manager_core as core. That flat import resolves only in the v3 custom_nodes/ layout; under the pip package the module is comfyui_manager.glob.manager_core, so it raises ModuleNotFoundError.

When it breaks. Only when COMFYUI_MANAGER_ARIA2_SERVER is set — download_url reaches aria2_download_url behind that check. For those users every model install and every CNR node install fails instantly, and aria2 is the only resumable download path Manager has.

Why the one-liner in the thread is not enough. from comfyui_manager.glob import manager_core as core fixes the import, but the next two lines read core.comfy_path, and v4 binds that name in comfyui_manager/common/context.py, not in manager_core. On manager-v4 (bd4ede2) comfyui_manager.glob.manager_core imports fine and hasattr(manager_core, 'comfy_path') is False, so the one-liner trades ModuleNotFoundError for AttributeError. The import has to reach context.

Why try/except rather than a plain package import. main:glob/manager_downloader.py and manager-v4:comfyui_manager/common/manager_downloader.py are byte-identical today, and on main the flat import is the correct one — glob/ is not a package there, so a relative import is not available either. The except arm is exactly what main does now. That makes this hunk correct in both layouts, so it does not have to be revisited when the v4 tree reaches main, and it answers the branch question left open in the thread rather than asking it again.

Verified at manager-v4 bd4ede2 and main f82970b: the patched file compiles and comfy_path resolves in both layouts (package arm through the real common/context.py, flat arm through the real glob/manager_core.py).

Not addressed here: the /models re-rooting a few lines below, raised as a follow-up on the same issue. That one changes behaviour for the separate-container aria2 setup documented in docs/en/use_aria2.md and needs a decision on which topology is supported, so it is left out of this fix.

Refs #3064

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