refactor(player): encapsulate game state behind PlayerSettings, clear VisibilityModifier and HiddenField

- ParkourUser/ParkourPlayer/GeneratorState public mutable fields -> private + short accessors
- per-player settings extracted to player/data/PlayerSettings (ParkourPlayer 188 -> 96 lines,
  PMD-counted methods 20 -> 9); this is what fixed the TooManyMethods violation that the
  encapsulation itself introduced — by decomposition, not by lowering the threshold
- disk storage reads and writes the same canonical 12-key map as the SQL JSON column;
  legacy key names normalized on read, @Expose dropped from domain classes
- 39 settings call sites rewritten across 7 files
- HiddenField backlog cleared (Config, ObstacleGenerator, GhostService, Leaderboard,
  PagedMenu, Reward, ParticleData, World)
- checkstyle ratchet: VisibilityModifier, HiddenField, EmptyLineSeparator and
  MissingDeprecated flipped to error once their counters hit zero; suppressions.xml empty
- javac -Xmaxwarns raised so NullAway/Error Prone counts are honest
  (baseline 165/289, now 164/265)

checkstyle 0 errors / 135 warnings, PMD 0 violations, tests 94/0 fail, ./gradlew check green.
TODO.md: items 30 and 107 updated, new items 167-170, ПРОГРЕСС-6/7 recorded.

src/main/java/dev/loki/loparkour/mode/base/Modes.java

@@ -21,35 +21,91 @@ public final class Modes {
     private Modes() {
     }
 
-    public static DefaultMode DEFAULT;
-    public static SpectatorMode SPECTATOR;
-    public static SpeedrunMode SPEEDRUN;
-    public static InvisibleBarrierMode INVISIBLE_BARRIER;
-    public static RaceMode RACE;
-    public static CoopMode COOP;
-    public static GravityShiftMode GRAVITY_SHIFT;
-    public static ElytraMode ELYTRA;
-    public static SpeedDemonMode SPEED_DEMON;
-    public static MinSpeedMode MIN_SPEED;
-    public static TimeTrialMode TIME_TRIAL;
-    public static CloseMode CLOSE;
-    public static ObstacleMode OBSTACLE;
-    public static DuelsMode DUELS;
+    private static DefaultMode defaultMode;
+    private static SpectatorMode spectator;
+    private static SpeedrunMode speedrun;
+    private static InvisibleBarrierMode invisibleBarrier;
+    private static RaceMode race;
+    private static CoopMode coop;
+    private static GravityShiftMode gravityShift;
+    private static ElytraMode elytra;
+    private static SpeedDemonMode speedDemon;
+    private static MinSpeedMode minSpeed;
+    private static TimeTrialMode timeTrial;
+    private static CloseMode close;
+    private static ObstacleMode obstacle;
+    private static DuelsMode duels;
 
     public static void init() {
-        DEFAULT = (DefaultMode) Registry.getMode("default");
-        SPECTATOR = (SpectatorMode) Registry.getMode("spectator");
-        SPEEDRUN = (SpeedrunMode) Registry.getMode("speedrun");
-        INVISIBLE_BARRIER = (InvisibleBarrierMode) Registry.getMode("invisible-barrier");
-        RACE = (RaceMode) Registry.getMode("race");
-        COOP = (CoopMode) Registry.getMode("coop");
-        GRAVITY_SHIFT = (GravityShiftMode) Registry.getMode("gravity-shift");
-        ELYTRA = (ElytraMode) Registry.getMode("elytra");
-        SPEED_DEMON = (SpeedDemonMode) Registry.getMode("speeddemon");
-        MIN_SPEED = (MinSpeedMode) Registry.getMode("minspeed");
-        TIME_TRIAL = (TimeTrialMode) Registry.getMode("timetrial");
-        CLOSE = (CloseMode) Registry.getMode("close");
-        OBSTACLE = (ObstacleMode) Registry.getMode("obstacle");
-        DUELS = (DuelsMode) Registry.getMode("duels");
+        defaultMode = (DefaultMode) Registry.getMode("default");
+        spectator = (SpectatorMode) Registry.getMode("spectator");
+        speedrun = (SpeedrunMode) Registry.getMode("speedrun");
+        invisibleBarrier = (InvisibleBarrierMode) Registry.getMode("invisible-barrier");
+        race = (RaceMode) Registry.getMode("race");
+        coop = (CoopMode) Registry.getMode("coop");
+        gravityShift = (GravityShiftMode) Registry.getMode("gravity-shift");
+        elytra = (ElytraMode) Registry.getMode("elytra");
+        speedDemon = (SpeedDemonMode) Registry.getMode("speeddemon");
+        minSpeed = (MinSpeedMode) Registry.getMode("minspeed");
+        timeTrial = (TimeTrialMode) Registry.getMode("timetrial");
+        close = (CloseMode) Registry.getMode("close");
+        obstacle = (ObstacleMode) Registry.getMode("obstacle");
+        duels = (DuelsMode) Registry.getMode("duels");
+    }
+
+    public static DefaultMode defaultMode() {
+        return defaultMode;
+    }
+
+    public static SpectatorMode spectator() {
+        return spectator;
+    }
+
+    public static SpeedrunMode speedrun() {
+        return speedrun;
+    }
+
+    public static InvisibleBarrierMode invisibleBarrier() {
+        return invisibleBarrier;
+    }
+
+    public static RaceMode race() {
+        return race;
+    }
+
+    public static CoopMode coop() {
+        return coop;
+    }
+
+    public static GravityShiftMode gravityShift() {
+        return gravityShift;
+    }
+
+    public static ElytraMode elytra() {
+        return elytra;
+    }
+
+    public static SpeedDemonMode speedDemon() {
+        return speedDemon;
+    }
+
+    public static MinSpeedMode minSpeed() {
+        return minSpeed;
+    }
+
+    public static TimeTrialMode timeTrial() {
+        return timeTrial;
+    }
+
+    public static CloseMode close() {
+        return close;
+    }
+
+    public static ObstacleMode obstacle() {
+        return obstacle;
+    }
+
+    public static DuelsMode duels() {
+        return duels;
     }
 }