Migrate from MongoDB to Couchbase Lite for local storage; update related services and configurations

plan.md

@@ -1,13 +1,13 @@
 # WorkTracker Implementation Plan (AI-Ready)
 
 ## 1) Chosen stack
-- **Frontend + backend host**: ASP.NET Core + Blazor Web App (.NET 8)
-- **Database**: MongoDB
+- **Frontend + backend host**: ASP.NET Core + Blazor Web App (.NET 9)
+- **Database**: Couchbase Lite (local embedded database)
 - **Auth approach (single user)**: ASP.NET Core Identity configured and enabled now; registration can be disabled later and one seeded account can be used.
 
 Why this stack:
 - Fits CRUD-heavy workflow with strong typing and server-side calculations.
-- MongoDB maps well to immutable daily snapshots (store coefficients used for each day).
+- Couchbase Lite keeps the app self-contained while still storing immutable daily snapshots locally.
 - Blazor provides responsive desktop/mobile UI in one codebase.
 
 ---
@@ -31,7 +31,7 @@ Required outputs:
 
 ---
 
-## 3) Data model design (MongoDB)
+## 3) Data model design (Couchbase Lite)
 
 ### 3.1 `AppSettings` (configurable defaults)
 - `id`
@@ -138,7 +138,7 @@ For Blazor Server/Web App, these can be implemented as internal services first a
 ---
 
 ## 8) Delivery roadmap
-1. Scaffold Blazor app + Identity + Mongo wiring
+1. Scaffold Blazor app + Identity + Couchbase Lite wiring
 2. Implement Settings and defaults
 3. Implement WorkDay model and calculation service
 4. Build daily entry page