feat(ev): add is_suspended/suspended_since to EVOpportunity

Additive optional fields mirroring the sharp-api-go EV engine's flag-gated
suspended-opportunity state (EV_SUSPENDED_STATE, sharp-api-go #789). When a
live opp's sharp reference is momentarily suspended the server keeps the opp
visible with is_suspended=true and ev_percentage hidden (never a stale edge);
the opp retains its stable id and updates in-place on resume. Fields default
to False/None and are absent from the wire unless the server flag is enabled,
so this is fully backward-compatible (no version bump).

Type: feat

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: paperclip-resolver[bot]

src/sharpapi/models.py

@@ -302,6 +302,12 @@ class EVOpportunity(BaseModel):
     # Structured side/segment axes (issue #76 / #689), additive + optional.
     team_side: str | None = None
     market_segment: str | None = None
+    # Suspended-state (server flag EV_SUSPENDED_STATE), additive + optional. While the sharp
+    # reference is momentarily suspended the opp stays visible with is_suspended=True and the
+    # edge hidden (ev_percentage is 0 / unknown — never a stale edge); suspended_since is the
+    # unix-seconds timestamp the suspension began. Absent unless the server flag is enabled.
+    is_suspended: bool = False
+    suspended_since: float | None = None
     # Optional structured refs (additive, non-breaking).
     home: TeamRef | None = None
     away: TeamRef | None = None