Add PocketBase client with contracts and sharp build tooling

Elternbeirat.Web.Tests/.editorconfig

@@ -0,0 +1,8 @@
+# Test-project-only overrides. This file inherits from the root .editorconfig
+# (root = true there) and applies on top of it for everything under this folder.
+
+[*.cs]
+# Test methods use Given_When_Then style names with underscores, which is the
+# common, readable convention for tests. CA1707 (no underscores in member names)
+# stays enforced in production code, but is turned off here.
+dotnet_diagnostic.CA1707.severity = none