Add UserStores and StorePickups tools; implement endpoints and update documentation

.github/plans/plan-managed-stores-pickups.prompt.md

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+## Plan: Implement Managed Stores Pickups MCP Tools
+
+To minimize API calls, we will implement the two necessary endpoints to first get the user's managed stores, and then fetch the upcoming pickups for each managed store.
+
+**Steps**
+1. **Analyze API Models**: Extract the response schemas for both endpoints from `fsopenapi.json` to create fully typed C# `record` responses (e.g., `StoreTeamMembershipWithPickupStatus` and the `occupiedSlots` structure).
+2. **Update Endpoints list**: Add `GetStoresOfUser` and `ListPickupsForStore` relative URLs to `FsMcp/Endpoints.cs`.
+3. **Implement User Stores Tool** (*parallel with step 4*): Create `FsMcp/Tools/UserStoresTools.cs` exposing a tool to call `GET /api/users/{userId}/stores`. Ensure `EnsureLoginAsync()` is called before making requests, and fully apply `[Description]` attributes to fields.
+4. **Implement Store Pickups Tool** (*parallel with step 3*): Create `FsMcp/Tools/StorePickupsTools.cs` exposing a tool to call `GET /api/stores/{storeId}/pickups`. Include the `occupiedSlots` with their `isConfirmed` property.
+5. **Register MCP Tools**: Add `.WithTools<UserStoresTools>()` and `.WithTools<StorePickupsTools>()` inside `FsMcp/Program.cs`.
+6. **Update Documents**: Add usage instructions, auth behaviors, and endpoint mappings to `FsMcp/README.md`.
+
+**Relevant files**
+- `fsopenapi.json` — Source of truth for OpenAPI schema properties
+- `FsMcp/Endpoints.cs` — Add static endpoint URLs
+- `FsMcp/Tools/UserStoresTools.cs` — Implements `GET /api/users/{userId}/stores`
+- `FsMcp/Tools/StorePickupsTools.cs` — Implements `GET /api/stores/{storeId}/pickups`
+- `FsMcp/Program.cs` — Tool registration
+- `FsMcp/README.md` — Documentation
+
+**Verification**
+1. Execute `dotnet build FsMcp/FsMcp.csproj -c Debug` to verify compilation.
+2. Launch the MCP server using the provided workspace task: `Run FsMcp Debug`.
+3. Once running, interactively test the tools by asking: "List stores I manage and show their open unconfirmed pickups" via this chat, ensuring both tools are successfully invoked by the MCP client.
+
+**Decisions**
+- `userId` in `GET /api/users/{userId}/stores` can receive `"current"` to simplify queries.
+- We implement two distinct tool classes rather than merging them to adhere to the existing `Tools/*Tools.cs` domain-driven naming pattern in the project.

.github/prompts/list-open-slot-requests.prompt.md

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+---
+agent: 'agent'
+model: Gemini 3 Flash (Preview) (copilot)
+tools: [foodsharing-mcp/get_user_stores, foodsharing-mcp/get_store_pickups]
+description: 'List open slot requests for my managed foodsharing stores'
+---
+
+Your goal is to look at all my stores that i manage (isManaging = true), retrieve the pickups and find  where the slot's isConfirmed property is false
+
+tools to use:
+'Foodsharing Mcp/get_user_stores'
+'Foodsharing Mcp/get_store_pickups'