langchain-openrouter 0.2.8

Changes since langchain-openrouter==0.2.7

release(openrouter): 0.2.8 (#39658) chore(model-profiles): refresh model profile data (#39646) chore(model-profiles): refresh model profile data (#39625) fix(openrouter): preserve cost metadata in usage chunks (#39338) chore(model-profiles): refresh model profile data (#39609) chore(model-profiles): refresh model profile data (#39579) chore(model-profiles): refresh model profile data (#39430) chore(model-profiles): refresh model profile data (#39344) chore(model-profiles): refresh model profile data (#39318) feat(openrouter): preserve provider in response metadata (#39301) chore(model-profiles): refresh model profile data (#39299) chore(model-profiles): refresh model profile data (#39239) chore(model-profiles): refresh model profile data (#39166) chore(model-profiles): refresh model profile data (#39141) chore(model-profiles): refresh model profile data (#39105) chore(model-profiles): refresh model profile data (#39084) chore(model-profiles): refresh model profile data (#39050) chore(model-profiles): refresh model profile data (#39036)