implement server mvp: fastapi app, org formatter, sqlite store, tests, dockerfile

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

server/app/models.py

@@ -0,0 +1,45 @@
+from pydantic import BaseModel, field_validator
+from typing import Literal
+
+
+class CaptureRequest(BaseModel):
+    id: str
+    created_at: str
+    kind: Literal["note", "todo"]
+    body: str
+    tags: list[str]
+    device: str
+
+    @field_validator("body")
+    @classmethod
+    def body_must_not_be_empty(cls, v: str) -> str:
+        stripped = v.strip()
+        if not stripped:
+            raise ValueError("body must not be empty")
+        return stripped
+
+    @field_validator("id")
+    @classmethod
+    def id_must_not_be_empty(cls, v: str) -> str:
+        if not v.strip():
+            raise ValueError("id must not be empty")
+        return v
+
+    @field_validator("device")
+    @classmethod
+    def device_must_not_be_empty(cls, v: str) -> str:
+        if not v.strip():
+            raise ValueError("device must not be empty")
+        return v
+
+
+class CaptureResponse(BaseModel):
+    ok: bool
+    status: str
+    id: str
+
+
+class HealthResponse(BaseModel):
+    ok: bool
+    service: str
+    version: str