Complete LinkSyncServer and LinkSyncExtension implementation

LinkSyncServer:
- Fix app.py imports, add CORS middleware, lifespan events
- Create api/routes.py router aggregator
- Create config/settings.py for centralized configuration
- Rewrite models/base.py with proper relationships and serialization
- Rewrite all API endpoints with real DB integration (auth, links, collections, sync, queries, tags)
- Add admin endpoints (user management, stats, audit log)
- Complete query parser with recursive descent and proper precedence
- Complete query executor with set operations and field filters
- Set up Alembic migrations with initial schema
- Create web interface (templates, CSS, JS)
- Add 42 passing tests (auth, links, collections, queries)
- Add deploy.ps1 and deploy.sh scripts
- Update README with deployment workflow

LinkSyncExtension:
- Create utils/api.js (REST client with retries, auth, error handling)
- Create utils/sync.js (3 sync modes + conflict detection)
- Create utils/collection.js (collection management)
- Create utils/query-engine.js (client-side query parser)
- Rewrite background.js (sync loop, bookmark events, message routing)
- Rewrite popup.js (tabs, settings modal, notifications, CRUD)
- Update popup.html (tabbed interface, query builder, modal)
- Update popup.css (full redesign)
- Create content/content.js (page metadata extraction)
- Create options.html/js (dedicated settings page)
- Generate icons (48x48, 96x96)
- Update manifest.json (host permissions, content scripts, options)
- Create AGENTS.md

LinkSyncServer/tests/test_collections.py

@@ -0,0 +1,83 @@
+"""
+LinkSyncServer - Collection API Tests
+"""
+
+import pytest
+from fastapi.testclient import TestClient
+
+
+class TestCollections:
+    def test_create_collection(self, client: TestClient, auth_headers: dict, sample_collection_data: dict):
+        response = client.post("/api/collections/", json=sample_collection_data, headers=auth_headers)
+        assert response.status_code == 201
+        data = response.json()
+        assert data["name"] == sample_collection_data["name"]
+        assert data["query_type"] == "static"
+
+    def test_list_collections(self, client: TestClient, auth_headers: dict, sample_collection_data: dict):
+        client.post("/api/collections/", json=sample_collection_data, headers=auth_headers)
+        response = client.get("/api/collections/", headers=auth_headers)
+        assert response.status_code == 200
+        assert isinstance(response.json(), list)
+
+    def test_get_collection(self, client: TestClient, auth_headers: dict, sample_collection_data: dict):
+        create_resp = client.post("/api/collections/", json=sample_collection_data, headers=auth_headers)
+        collection_id = create_resp.json()["id"]
+        response = client.get(f"/api/collections/{collection_id}", headers=auth_headers)
+        assert response.status_code == 200
+        assert response.json()["id"] == collection_id
+
+    def test_update_collection(self, client: TestClient, auth_headers: dict, sample_collection_data: dict):
+        create_resp = client.post("/api/collections/", json=sample_collection_data, headers=auth_headers)
+        collection_id = create_resp.json()["id"]
+        response = client.put(
+            f"/api/collections/{collection_id}",
+            json={"name": "Updated Name"},
+            headers=auth_headers,
+        )
+        assert response.status_code == 200
+        assert response.json()["name"] == "Updated Name"
+
+    def test_delete_collection(self, client: TestClient, auth_headers: dict, sample_collection_data: dict):
+        create_resp = client.post("/api/collections/", json=sample_collection_data, headers=auth_headers)
+        collection_id = create_resp.json()["id"]
+        response = client.delete(f"/api/collections/{collection_id}", headers=auth_headers)
+        assert response.status_code == 200
+        assert response.json()["deleted_id"] == collection_id
+
+    def test_add_links_to_collection(
+        self, client: TestClient, auth_headers: dict, sample_bookmark_data: dict, sample_collection_data: dict
+    ):
+        bm_resp = client.post("/api/links/", json=sample_bookmark_data, headers=auth_headers)
+        bookmark_id = bm_resp.json()["id"]
+
+        col_resp = client.post("/api/collections/", json=sample_collection_data, headers=auth_headers)
+        collection_id = col_resp.json()["id"]
+
+        response = client.post(
+            f"/api/collections/{collection_id}/add-links",
+            json=[bookmark_id],
+            headers=auth_headers,
+        )
+        assert response.status_code == 200
+        assert response.json()["added_count"] == 1
+
+    def test_remove_links_from_collection(
+        self, client: TestClient, auth_headers: dict, sample_bookmark_data: dict, sample_collection_data: dict
+    ):
+        bm_resp = client.post("/api/links/", json=sample_bookmark_data, headers=auth_headers)
+        bookmark_id = bm_resp.json()["id"]
+
+        col_data = sample_collection_data.copy()
+        col_data["link_ids"] = [bookmark_id]
+        col_resp = client.post("/api/collections/", json=col_data, headers=auth_headers)
+        collection_id = col_resp.json()["id"]
+
+        response = client.request(
+            "DELETE",
+            f"/api/collections/{collection_id}/remove-links",
+            json=[bookmark_id],
+            headers=auth_headers,
+        )
+        assert response.status_code == 200
+        assert response.json()["removed_count"] == 1