fix: ignore case for online player command lookups

[Miroshka000]

Summary

• ignore case when resolving online player names for command lookups
• keep exact match priority and only fall back to a unique case-insensitive online match
• do not guess or rewrite offline names when no online player matches
• apply the same behavior to name selectors and operator/whitelist/ban player-name checks

Testing

• ./gradlew clean :server:test --tests "org.allaymc.server.player.PlayerNameMatcherTest" --tests "org.allaymc.server.command.selector.args.NameSelectorArgumentTest"

[codecov]

Codecov Report

❌ Patch coverage is 30.43478% with 48 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
.../org/allaymc/server/player/AllayPlayerManager.java	0.00%	18 Missing ⚠️
...a/org/allaymc/server/player/PlayerNameMatcher.java	57.14%	7 Missing and 8 partials ⚠️
...g/allaymc/server/command/defaults/DeOpCommand.java	0.00%	5 Missing ⚠️
...org/allaymc/server/command/defaults/OpCommand.java	0.00%	5 Missing ⚠️
...aymc/server/command/defaults/WhitelistCommand.java	0.00%	4 Missing ⚠️
...org/allaymc/server/command/selector/args/Name.java	50.00%	0 Missing and 1 partial ⚠️

Files with missing lines	Coverage Δ	Complexity Δ
...org/allaymc/server/command/selector/args/Name.java	91.66% <50.00%> (+66.66%)	8.00 <2.00> (+5.00)
...aymc/server/command/defaults/WhitelistCommand.java	37.77% <0.00%> (ø)	2.00 <0.00> (ø)
...g/allaymc/server/command/defaults/DeOpCommand.java	23.52% <0.00%> (-3.14%)	2.00 <0.00> (ø)
...org/allaymc/server/command/defaults/OpCommand.java	23.52% <0.00%> (-3.14%)	2.00 <0.00> (ø)
...a/org/allaymc/server/player/PlayerNameMatcher.java	57.14% <57.14%> (ø)	13.00 <13.00> (?)
.../org/allaymc/server/player/AllayPlayerManager.java	15.24% <0.00%> (-1.21%)	3.00 <0.00> (ø)

... and 4 files with indirect coverage changes

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