feat: add shared config and models

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/shared/models.py

@@ -0,0 +1,54 @@
+from dataclasses import dataclass
+from datetime import datetime
+from typing import Optional
+
+
+@dataclass
+class Room:
+    id: int
+    name: str
+    device_label: Optional[str]
+    is_active: bool
+    last_seen: Optional[datetime]
+    created_at: datetime
+
+
+@dataclass
+class Speaker:
+    id: int
+    name: str
+    created_at: datetime
+    updated_at: datetime
+
+
+@dataclass
+class VoiceEmbedding:
+    id: int
+    speaker_id: int
+    embedding: bytes  # packed float32
+    audio_sample: Optional[bytes]
+    created_at: datetime
+
+
+@dataclass
+class Utterance:
+    id: int
+    room_id: int
+    speaker_id: Optional[int]
+    transcript: str
+    embedding: Optional[bytes]
+    match_status: str  # known | unknown | ambiguous | unreviewed
+    match_confidence: Optional[float]
+    start_time: datetime
+    end_time: datetime
+    audio_clip_path: Optional[str]
+    livekit_room: Optional[str]
+    created_at: datetime
+
+
+@dataclass
+class DailySummary:
+    id: int
+    date: str  # YYYY-MM-DD
+    summary_text: str
+    generated_at: datetime