Add the authored lineage2_Unknown.png placeholder (#3)

[avandenberghe]

Refs #3 — one of that issue's 12 missing class_images/ icons. Adds lineage2_Unknown.png at 30x30, matching all 98 existing class icons.

Note the capitalised filename: the installer seeds lineage2_Unknown, unlike every other plugin's lowercase convention. The file matches the seeded value exactly, since case matters on a Linux host even though it doesn't on macOS. avathar/bbguild#391 suggests normalising that to lowercase — deliberately not done here, as it's a data change needing a migration, not an asset fix.

Still open on #3: the 11 starter-class icons. Still open on #7: 110 roster_classes/ portraits, which is why that directory's coverage test is skipped with the reason stated.

Why authored rather than sourced

class_id 0 — what a character gets when a sync cannot map its class — has always seeded this imagename with no file behind it. avathar/bbguild#389 added a fallback chain that ends at <game>_unknown.png, so without this file its last step could never fire.

No wiki or API has a generic "unknown class" icon, which is exactly why avathar/bbguild#391 singles these out as the one part of the icon backlog where authored placeholders are the right answer rather than a stopgap. This follows the roadmap's sourcing policy (avathar/bbguild#393): authored placeholders where no provenance exists.

Design

A ? glyph, matching what the family already does here — bbguildwow's wow_unknown is a red ? on a plate, bbguildlotro's race unknown a grey ? on gold. Warm gold with a dark outline so it stays legible on both light prosilver and dark styles (pbwow3), drawn at 8x and downsampled.

Test

The new *_icon_coverage_test parses the installer's seeded imagename values and asserts both icon directories cover them, listing the remaining gaps explicitly — so a new gap fails CI instead of going unnoticed, and the known ones are documented in code rather than only in tickets.

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