feat(catalog): add channel control overlay mutations

[MrFr3di]

Scope

Implements the first Channel Control core slice on top of the existing profile-scoped UserChannelOverlay model.

• expose typed mutations for hide/unhide, custom name, custom channel number, and presentation reset;
• preserve the existing Favorite contract (hidden channels still return NotFound for Favorite);
• update only the targeted overlay column for each mutation;
• allow hidden active channels to be unhidden/renamed/renumbered/reset;
• validate custom names (trimmed, non-blank, no control chars, <=128 code points) and custom numbers (1..9999);
• reset presentation fields without clearing Favorite;
• no Room schema/version change;
• no provider/Xtream/player ownership change.

Test intent

The branch contains an API contract test plus Room instrumented behavior tests for hide/unhide, rename preservation/validation, channel-number reset/validation, reset semantics, and missing/inactive channels.

This PR is intentionally draft while exact-head CI evidence is collected. It is not ready to merge until the database device matrix and relevant hosted checks are green.

Follow-up slices

After this core mutation contract is verified, the next planned slice is the hidden-aware management read projection, followed by the TV management surface and long-Select quick actions.

[MrFr3di]

2026-09-01 restack analysis against main@d48656752474b5fc2e004965e6acb2a552671253: this CC-1 branch is historically 72 commits behind, but none of its six semantic files changed on main since merge-base 221db84e.... Therefore CC-1 can be rebuilt as one clean byte-for-byte commit on the post-Android17 main; no semantic conflict resolution is required. Do not merge the old 8-commit history directly. Requalify the rebuilt exact head before merge.