feat(diagnostics): debug sessions — start, stop, the tag on every line, screenshots (E16 S1)

A session is one recording, capped at 60 minutes by the server. While it is
open, a request naming the caller's own session in X-Debug-Session is logged
at the session's level with every line tagged; a header naming anything else
is ignored. The browser's batches count a session as consent to its level and
keep the tag only on its own events. Screenshots are judged by their bytes,
capped in size and count, and served back to their owner only.

- debug_sessions / debug_screenshots tables, one open session per user
  (partial unique index), log_events.debug_session_id indexed
- /api/debug-sessions: start (joins a running one), stop, list, get, events,
  screenshots; /api/me reports the live session
- the hourly log job closes expired sessions and drops them with the logs
- logsink.serialize and routes._common.capped_body shared by their readers

backend/app/logsink.py

@@ -44,6 +44,7 @@ from app import logs
 from app.config import settings
 from app.db import engine
 from app.models import LogEvent
+from app.utils import iso
 
 QUEUE_MAX = 10_000
 BATCH_MAX = 500
@@ -343,3 +344,24 @@ def gc(db: Session, retention_days: int) -> int:
     cutoff = datetime.now(timezone.utc) - timedelta(days=max(1, retention_days))
     result = db.execute(delete(LogEvent).where(LogEvent.ts < cutoff))
     return result.rowcount or 0
+
+
+def serialize(row: LogEvent) -> dict:
+    """A stored row as the API sends it — one shape for every reader: the admin console (E22.6) and
+    a debug session's evidence list (E16)."""
+    return {
+        "id": row.id,
+        "ts": iso(row.ts),
+        "level": row.level,
+        "source": row.source,
+        "logger": row.logger,
+        "event": row.event,
+        "msg": row.msg,
+        "attrs": row.attrs,
+        "exc": row.exc,
+        "request_id": row.request_id,
+        "user_id": row.user_id,
+        "job_id": row.job_id,
+        "debug_session_id": row.debug_session_id,
+        "version": row.version,
+    }