User Story: Station Bot manufacturing channel and role wiring

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User Story

As a guild owner or guild admin, I need to configure the manufacturing forum, staff channel, and manufacturing role wiring so that the bot can route manufacturing activity to the correct Discord locations and permissions.

Definition of Done

• Station exposes manufacturingForumChannelId, manufacturingStaffChannelId, and manufacturingRoleId
• Channel/role validation and save/reload flows are covered by tests
• pnpm typecheck passes

Acceptance Criteria

• A guild admin can configure the manufacturing forum/staff channel and role from Station
• Invalid channel or role IDs are rejected with field-level validation
• Saved values persist on reload

Technical Elaboration

This ticket covers the core manufacturing Discord wiring fields only. It is separate from feature enablement, limits, create-order copy, thread references, and keepalive scheduling.

Design Elaboration

This UI should make it clear that these values are infrastructure wiring for the manufacturing workflow and that incorrect IDs will break Discord-side behavior.

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Parent Epic: #231
Depends on: #232, #233, #242