Add GetCombatLogPath/GetChatLogPath Lua functions, update log path globals

Register Lua functions to expose current log paths. At PLAYER_LOGIN,
overwrite COMBATLOGENABLED/CHATLOGENABLED globals with actual redirected
paths (English locale only). Update DLL_README with Lua API and logging
enable instructions.

src/main.zig

@@ -108,6 +108,10 @@ fn registerLuaFunctions() void {
     if (build_opts.outline) {
         registerFunction("OutlineCommand", @intFromPtr(&outline.outlineCommand));
     }
+    if (build_opts.combatlog) {
+        registerFunction("GetCombatLogPath", @intFromPtr(&combatlog.luaGetCombatLogPath));
+        registerFunction("GetChatLogPath", @intFromPtr(&combatlog.luaGetChatLogPath));
+    }
     if (build_opts.worldmarkers and markers.isActive()) {
         // User-facing functions stay global
         registerFunction("WorldMarker", @intFromPtr(&markers.luaWorldMarker));