feat: Implement web-based terminal with session management, command history, and dedicated UI.

app/crud/terminal_command_log.py

@@ -201,6 +201,7 @@ class TerminalCommandLogRepository:
                 TerminalCommandLog.command_hash,
                 func.max(TerminalCommandLog.created_at).label("max_created"),
                 func.count(TerminalCommandLog.id).label("execution_count"),
+                func.max(TerminalCommandLog.is_pinned).label("is_pinned"),
             )
             .where(and_(*conditions))
             .group_by(TerminalCommandLog.command_hash)
@@ -214,13 +215,15 @@ class TerminalCommandLogRepository:
                 TerminalCommandLog.command_hash,
                 subq.c.max_created,
                 subq.c.execution_count,
+                subq.c.is_pinned,
             )
             .join(subq, and_(
                 TerminalCommandLog.command_hash == subq.c.command_hash,
                 TerminalCommandLog.created_at == subq.c.max_created,
             ))
             .where(TerminalCommandLog.host_id == host_id)
-            .order_by(subq.c.max_created.desc())
+            # Sort by pinned status first (pinned at top), then by max_created
+            .order_by(subq.c.is_pinned.desc(), subq.c.max_created.desc())
             .limit(limit)
         )
         
@@ -233,6 +236,7 @@ class TerminalCommandLogRepository:
                 "command_hash": row.command_hash,
                 "last_used": row.max_created,
                 "execution_count": row.execution_count,
+                "is_pinned": bool(row.is_pinned),
             }
             for row in rows
         ]

app/crud/terminal_session.py

@@ -128,6 +128,20 @@ class TerminalSessionRepository:
             ).order_by(TerminalSession.created_at.desc())
         )
         return list(result.scalars().all())
+
+    async def list_active_for_host(self, host_id: str) -> List[TerminalSession]:
+        """List all active sessions for a specific host."""
+        now = datetime.now(timezone.utc)
+        result = await self.session.execute(
+            select(TerminalSession).where(
+                and_(
+                    TerminalSession.host_id == host_id,
+                    TerminalSession.status == SESSION_STATUS_ACTIVE,
+                    TerminalSession.expires_at > now
+                )
+            ).order_by(TerminalSession.created_at.desc())
+        )
+        return list(result.scalars().all())
     
     async def list_all_active(self) -> List[TerminalSession]:
         """List all active sessions (for admin/GC)."""