docs: Update README with deploy URL and content refinements, and ignore .factory files.

.gitignore

@@ -27,3 +27,4 @@ build/
 *.swo
 thumbs.db
 /docs
+/.factory

README.md

@@ -1,5 +1,7 @@
 # Algorithm Test Case Generation and Verification Platform
 
+Deploy URL: https://pd-final.hissin.net/
+
 ## Project Structure
 - `backend/`: FastAPI Python Backend
 - `frontend/`: React Vite Frontend
@@ -17,7 +19,6 @@ docker-compose up --build
 Then access:
 - **Frontend**: http://localhost
 - **Backend API**: http://localhost:8000
-- **API Docs**: http://localhost:8000/docs
 
 ### Manual Setup
 
@@ -38,12 +39,4 @@ cd frontend
 npm install
 npm run dev
 ```
-Frontend will run at `http://localhost:5173`
-
-## Features Implemented
-1.  **Maximum Subarray Sum**:
-    -   Brute Force ($O(N^2)$)
-    -   Divide & Conquer ($O(N \log N)$)
-    -   Kadane's Algorithm ($O(N)$)
-    -   Automatic Random Case Generation
-    -   Performance Benchmarking & Visualization
+Frontend will run at `http://localhost:5173`