Bug fix. Edge case where bots would get stuck in cities. (#2269)

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## Pull Request Description
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When I refactored flight destinations, I wanted to make where bots go
more intentional. so I made it dependent on the
allianceHubsPerLevelCache and hodeHubsPerLevelCache. This system relied
on there being an innkeeper in each area that the bots would fly to.
However, not every zone has an innkeeper, and so there was an odd
situation where bots had nowhere to fly to. (Most notably at level 53.)
This solves that by hardcoding the flightmasters in those areas into the
cache.

I also put back in the city teleport probability check which was forcing
every bot to teleport to a city on level up.


## Feature Evaluation
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    - - [ ] Minimal impact (**explain below**)
    - - [ ] Moderate impact (**explain below**)



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    - - [ ] Yes (**explain why**)



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    - - [ ] Yes (**explain below**)



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Debugging and comments.



## Final Checklist

- - [x] Stability is not compromised.
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- - [x] Added logic complexity is justified and explained.
- - [x] Documentation updated if needed (Conf comments, WiKi commands).

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src/Bot/RandomPlayerbotMgr.cpp

@@ -1768,13 +1768,16 @@ void RandomPlayerbotMgr::RandomTeleportForLevel(Player* bot)
     if (bot->InBattleground())
         return;
 
+    if (bot->GetLevel() >= 10 && urand(0, 100) < sPlayerbotAIConfig.probTeleToBankers * 100)
+    {
         std::vector<WorldLocation> locs = sTravelMgr.GetCityLocations(bot);
         if (!locs.empty())
         {
             RandomTeleport(bot, locs, true);
             return;
         }
-    locs = sTravelMgr.GetTeleportLocations(bot);
+    }
+    std::vector<WorldLocation> locs = sTravelMgr.GetTeleportLocations(bot);
     if (!locs.empty())
     {
         RandomTeleport(bot, locs, false);

src/Mgr/Travel/TravelMgr.cpp

@@ -4419,6 +4419,7 @@ std::vector<std::vector<uint32>> TravelMgr::GetOptimalFlightDestinations(Player*
                                             bot->GetTeamId());
     if (!fromNode)
         return validDestinations;
+
     std::vector<WorldLocation> candidateLocations;
     if (bot->GetLevel() >= 10 && urand(0, 100) < sPlayerbotAIConfig.probTeleToBankers * 100)
         candidateLocations = GetCityLocations(bot);
@@ -4673,6 +4674,31 @@ void TravelMgr::PrepareDestinationCache()
                 if (forAlliance)
                     allianceFlightMasterCache[guid] = pos;
                 flightMastersCount++;
+
+                // Zones that have flight masters but no innkeepers — use flight master as hub
+                static const std::set<uint32> zonesWithoutInnkeeper = {
+                    4,    // Blasted Lands (52-57)
+                    16,   // Azshara (45-52)
+                    28,   // Western Plaguelands (50-60)
+                    46,   // Burning Steppes (51-60)
+                    51,   // Searing Gorge (45-51)
+                    361,  // Felwood (47-57)
+                    490,  // Un'Goro Crater (49-56)
+                    2817, // Crystalsong Forest (77-80)
+                    4197  // Wintergrasp (79-80)
+                };
+                if (zonesWithoutInnkeeper.count(areaId))
+                {
+                    LevelBracket bracket = zone2LevelBracket[areaId];
+                    WorldPosition loc(mapId, x + cos(orient) * 5.0f, y + sin(orient) * 5.0f, z + 0.5f, orient + M_PI);
+                    for (int i = bracket.low; i <= bracket.high; i++)
+                    {
+                        if (forHorde)
+                            hordeHubsPerLevelCache[i].push_back(loc);
+                        if (forAlliance)
+                            allianceHubsPerLevelCache[i].push_back(loc);
+                    }
+                }
             }
             else if (creatureTemplate->npcflag & UNIT_NPC_FLAG_INNKEEPER)
             {