Phase 3: Graph view, backlinks, quick switcher, export

- Add outgoing_links (JSON) and backlinks_count to Document model
- POST /documents/{id}/detect-links — detect [[uuid]] patterns in content
- GET /documents/{id}/backlinks — documents referencing this doc
- GET /documents/{id}/outgoing-links — documents this doc references
- GET /documents/{id}/links — combined incoming + outgoing
- GET /projects/{id}/graph — full project relationship graph
- GET /search/quick — fuzzy search (Quick Switcher Cmd+K)
- GET /projects/{id}/documents/search — project-scoped search
- GET /documents/{id}/export — markdown|json export
- GET /projects/{id}/export — json|zip export
- 27 new tests

app/schemas/search.py

@@ -16,3 +16,39 @@ class SearchResult(BaseModel):
 
 class SearchResponse(BaseModel):
     results: list[SearchResult]
+
+
+# =============================================================================
+# Phase 3: Quick Switcher Schemas (Fuzzy Search)
+# =============================================================================
+
+class QuickSwitcherItem(BaseModel):
+    id: str
+    type: str  # "document" | "project"
+    title: str
+    subtitle: str | None = None
+    highlight: str | None = None  # HTML with <mark> tags
+    icon: str | None = None
+    project_id: str | None = None
+
+
+class QuickSwitcherResponse(BaseModel):
+    query: str
+    results: list[QuickSwitcherItem]
+    total: int
+    search_type: str = "fuzzy"
+
+
+class ProjectDocumentSearchItem(BaseModel):
+    document_id: str
+    title: str
+    excerpt: str
+    updated_at: datetime
+    score: float
+
+
+class ProjectDocumentSearchResponse(BaseModel):
+    project_id: str
+    query: str
+    results: list[ProjectDocumentSearchItem]
+    total: int