feat: add shared data models

src/teampulse/models.py

@@ -0,0 +1,24 @@
+from dataclasses import dataclass, field
+from datetime import datetime
+
+
+@dataclass
+class ChatMessage:
+    sender: str
+    text: str
+    timestamp: datetime
+
+
+@dataclass
+class AuditEntry:
+    display_name: str
+    email: str
+
+
+@dataclass
+class AuditWindow:
+    presenter: str
+    moderator: str
+    start_time: datetime
+    end_time: datetime
+    entries: list[AuditEntry] = field(default_factory=list)