Refactor stored procedure and update project structure

- Modified the stored procedure `fds__admin_getReportCatalog.sql` to use the correct schema for `all_objects`.
- Added new folders and projects for `eRechnungLib` in the solution file `Fuchs_Intranet.slnx`, including validation and test projects.
- Updated submodule reference for `OCORE`.
- Added new submodule `eRechnungLib` with initial commit.

.github/copilot-instructions.md

@@ -15,6 +15,7 @@
 - Build app: `dotnet build Fuchs/Fuchs.csproj -c Debug`. Build all: `dotnet build Fuchs_Intranet.slnx -c Debug`.
 - Frontend assets are source-built: run the gulp tasks in `Fuchs/` (`npx gulp min`, or `npx gulp all` when copied/static assets also need refreshing) whenever JS or SCSS/CSS sources change. The generated files under `Fuchs/wwwroot/web/` are what the app serves.
 - Test: `dotnet test Fuchs.Tests/Fuchs.Tests.csproj -c Debug`.
+- Submodules include the OCORE projects and `eRechnungLib` (ZUGFeRD/Factur-X + XRechnung generation) — invoices are moving to eRechnung output.
 - Project structure (relative to `Fuchs/`):
   - `Controllers/` — `IntranetController` partials (no area)
   - `code/` — business logic, PDF, email, widgets, data models