Exclude private players from rankings

[JanMikes]

Summary

The result image (cached PNG, shared on social media), the post-submit recap page, the player profile, the compare-players page, and the global pairs/groups ladders all counted private puzzlers in their rank totals and positions. This PR makes the ranking SQL ignore private players, with one exception: the subject of the ranking is always included so a private user still sees their own rank on their own pages.

• `GetRanking` (used by recap, result image, player profile, comparison, `PlayerSolvedPuzzles` / `MostSolvedPuzzles` / `RecentActivity`): JOIN `player` in the `BestTimes` CTE and require `(is_private = false OR id = :playerId)`. The subject (`:playerId`) is exactly the player whose rank is shown — no new parameter needed.
• `GetFastestPairs` / `GetFastestGroups` (global `LadderTable`): `HAVING bool_or(p.is_private = false)` on the puzzlers aggregate, so a team is shown only if at least one member is public — matching `PuzzlesSorter::filterOutPrivateProfiles` for an anonymous viewer and the existing solo `GetFastestPlayers` behavior.
• `GetPlayerRatingRanking`: same subject exception in `playerPosition` and `allForPlayer` so a private player can see their own MSP-Rating; `ranking()`/`totalCount()`/`distinctCountries()` (global views) are unchanged and still hide private players entirely.

`PuzzleTimes` already filters per-viewer via `PuzzlesSorter::filterOutPrivateProfiles($grouped, $loggedPlayerId)` (with the logged-user exception), so its query stays untouched.

Test plan

New / extended PHPUnit tests cover:

• `GetRankingTest`: public subject excludes a private peer from rank/total; private subject sees self in own rank; non-solver returns null.
• `GetFastestPairsTest`: a mixed (one public + one private) team is still shown; flipping the public puzzler to private hides both fixture pair entries.
• `GetPlayerRatingRankingPrivacyTest`: seeded `PlayerElo` rows; `ranking()`/`totalCount()` drop a now-private player; `playerPosition()` for that private subject still returns their rank; `allForPlayer()` for the private subject includes self in rank/total; other public peers' positions renumber correctly when a peer is hidden.

Manual smoke (post-merge):

• As a public solver on a puzzle that has a faster private peer, open `/cas-pridan/{timeId}` — "Rank X of Y" should drop by one (or more) vs. before. The matching `/result-image/{timeId}` PNG agrees on next regeneration (existing cached PNGs persist for up to 1 month at `players/{playerId}/results/{timeId}.png`).
• Log in as a private user, submit a time, open the recap — own rank visible with self counted.
• `/ladder` pairs/groups tabs no longer show fully-private teams.
• `/msp-rating` as a private logged-in user shows the personal position chip.

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