Add expansion DBC CSVs, Turtle support, and server-specific login

include/pipeline/asset_manager.hpp

@@ -71,6 +71,13 @@ public:
      */
     BLPImage loadTexture(const std::string& path);
 
+    /**
+     * Set expansion-specific data path for CSV DBC lookup.
+     * When set, loadDBC() checks expansionDataPath/db/Name.csv before
+     * falling back to the manifest (binary DBC from extracted MPQs).
+     */
+    void setExpansionDataPath(const std::string& path);
+
     /**
      * Load a DBC file
      * @param name DBC file name (e.g., "Map.dbc")
@@ -127,6 +134,7 @@ public:
 private:
     bool initialized = false;
     std::string dataPath;
+    std::string expansionDataPath_;  // e.g. "Data/expansions/wotlk"
 
     // Base manifest (loaded from dataPath/manifest.json)
     AssetManifest manifest_;

include/pipeline/dbc_loader.hpp

@@ -130,6 +130,12 @@ private:
     mutable bool idCacheBuilt = false;
 
     void buildIdCache() const;
+
+    /**
+     * Load from CSV text format (produced by dbc_to_csv tool).
+     * Rebuilds the same in-memory layout as binary load.
+     */
+    bool loadCSV(const std::vector<uint8_t>& csvData);
 };
 
 } // namespace pipeline