feat(wallet): 流水 remark 语义化 + 比价里程碑暂不发金币

- 签到发奖 remark='每日签到 第N天';看视频发奖 remark='看视频奖励金币'(原'看广告奖励')

- 比价战绩里程碑领取暂不真发金币(产品定,后续删该功能):仍记领取/标记已领,但不调 grant_coins、余额不变、coin_awarded 恒 0

- 同步 test_compare_milestone(领取后余额不变/coin_awarded==0) + docs/api/compare-milestone-claim

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

tests/test_compare_milestone.py

@@ -82,8 +82,8 @@ def test_unlock_progresses_with_success(client) -> None:
     assert states[2] == "locked"
 
 
-def test_claim_grants_coin_and_becomes_claimed(client) -> None:
-    """领第 1 档:发对应金币,进金币余额,该档变 claimed。"""
+def test_claim_marks_claimed_without_coin(client) -> None:
+    """领第 1 档:暂不真发金币(产品定,后续删该功能),余额不变,但该档变 claimed。"""
     token = _login(client, "13800003003")
     _report_success(client, token, "s-1")
 
@@ -93,8 +93,8 @@ def test_claim_grants_coin_and_becomes_claimed(client) -> None:
     assert r.status_code == 200, r.text
     res = r.json()
     assert res["milestone"] == 1
-    assert res["coin_awarded"] == RECORD_MILESTONES[0]
-    assert res["coin_balance"] == bal_before + RECORD_MILESTONES[0]
+    assert res["coin_awarded"] == 0          # 不再发金币
+    assert res["coin_balance"] == bal_before  # 余额不变
 
     d = client.get("/api/v1/compare/milestones", headers=_auth(token)).json()
     assert d["milestones"][0]["state"] == "claimed"