Layer8Problem-AP v0.6.0

DeathLink consolidation, language switch restored, day cleanup.

Breaking (YAML)

• Removed deathlink_termination, deathlink_warning, deathlink_steam,
  deathlink_rage_quit, and deathlink_filter. The single master
  deathlink: true / false now enables all four causes (termination,
  final warning, letting off steam, rage quit) with no filter.
• Removed Survived Tuesday and Survived Thursday locations. The game
  has only three playable days: Monday (hard), Wednesday (normal),
  Friday (easy). Location offsets 103 / 104 are reserved and must not
  be reused.

Client

• Restored the DE / EN language toggle on the AP connect screen.
  It was supposed to live there since v0.3.x but went missing along the way.
• Removed the DeathLink checkbox from the connect screen. The YAML is the
  single source of truth — the client always advertises the DeathLink tag
  on Connect and gates send / receive on slot_data.deathlink.
• daysSurvived hook clamped to 3 (Mon / Wed / Fri).
• Removed the dead item_<id> location check in the inventory wrapper that
  never resolved to a real location ID.

apworld

• Options.py reduced to goal, starting_day, deathlink.
• Locations.py DAY_NAMES is now Survived Monday / Wednesday / Friday.
• required_client_version bumped to (0, 6, 0).
• fill_slot_data no longer emits per-cause / filter keys.