fix: board import no longer pulls InvokeAI canvas intermediates and masks

[lstein]

Problem

Importing an InvokeAI board into PhotoMap also pulled in intermediate images from the canvas — region masks, staging composites, ControlNet inputs — that InvokeAI's own gallery never shows.

fetch_board_image_names called GET /api/v1/boards/{board_id}/image_names with no query parameters. On the InvokeAI side, that endpoint's categories and is_intermediate filters both default to None, which means no filtering at all: every image row associated with the board comes back. InvokeAI's own frontend never calls it unfiltered — it always passes is_intermediate: false and a category list (['general'] for the Images tab, ['control','mask','user','other'] for Assets).

Fix

Pass is_intermediate=false and categories=general&categories=user on every board fetch. That imports finished generations plus user-uploaded images — the gallery's Images tab plus user assets — while excluding masks, control images, and canvas intermediates.

Compatibility: InvokeAI servers that predate these query params ignore unknown parameters (FastAPI behavior), so they return the unfiltered list exactly as before — no version probe needed.

Note: the filter only affects future syncs. Board albums that already contain intermediates will keep them until the album is updated/reindexed.

Testing

• New tests/backend/test_invokeai_client.py asserts the filter params are sent for every board request (including the "none"/Uncategorized bucket) and that cross-board deduplication is preserved. The existing board-index tests mock fetch_board_image_names wholesale, so this covers the request-building layer they skip.
• pytest tests/backend/test_invokeai_client.py tests/backend/test_invokeai_board_index.py tests/backend/test_invoke_router.py — 92 passed.
• ruff check photomap tests — clean.
• User-tested against a live InvokeAI instance: board import excludes region masks after the change.

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