Items: hide full ammo pickups; robust close-target projection

- Resolve m_iAmmo and m_hMyWeapons arrays from the client recv tables.
- "Only if usable" now compares m_iAmmo[type] against sk_max_* (stock caps as
  fallback: RPG rockets 3, AR2 60, ...). Full ammo hides the pickup, including
  RPG rockets and fallen weapons converted to ammo.
- Inventory now comes from m_hMyWeapons directly, so fallen weapons are ammo
  before the player equips the matching weapon.
- Projection: fall back to local math when ScreenPosition claims "behind" for
  a point with positive view depth, and build NPC boxes from vertical samples
  so feet behind the near plane no longer drop the whole target. Log the first
  8 near-target projection failures for diagnosis.

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