core_avatar_png() and config_org_avatar_png() were hive-sh4re
functions used only by hive-c0re::forge::users. Move them there as
private path-resolution helpers (core_avatar_png_path,
config_org_avatar_png_path), following the existing
std::env::var(...).expect(...) required-env-var style used elsewhere
in hive-c0re.
The org avatar is now independently configurable:
services.hyperhive.c0re.orgAvatarPng (nullable path, default null)
lets an operator override just the agent-configs org avatar PNG
without replacing the whole assets package. Wired via a new
HIVE_ORG_AVATAR_PNG env var that falls back to the bundled PNG when
the option is unset. The core avatar stays under HIVE_ASSETS_DIR,
unchanged.
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