build: make coverageExclude actually exclude the generated API client

The entry was a bare workspace-relative path ("libs/shared/src/
infrastructure/api-client.ts" in the app projects, "src/infrastructure/
api-client.ts" in the libraries) while every sibling in the same list is a
glob. It matched nothing, so the 2372-line NSwag client was instrumented in
all four projects: 987 mostly-uncovered lines that dragged the reported
libs/shared/infrastructure figure from 94.7% down to 6.9%.

Normalizes all four to "**/infrastructure/api-client.ts" and adds the entry
to the beheer project, which was missing it entirely. api-client.provider.ts
is hand-written and stays covered.

Effect on the shared project's reported coverage: lines 96.2% -> 90.5% and
branches 85.1% -> 80.2%, because the denominator is now real source instead
of generated code inflating it.

Found by the metrics baseline (BL-008).

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

angular.json

@@ -106,7 +106,7 @@
                 "**/*.spec.ts",
                 "**/*.stories.ts",
                 "**/contracts/**",
-                "libs/shared/src/infrastructure/api-client.ts",
+                "**/infrastructure/api-client.ts",
                 "apps/ssp/src/main.ts",
                 "**/*.testing.ts",
                 "**/*.d.ts"
@@ -235,7 +235,7 @@
                 "**/*.spec.ts",
                 "**/*.stories.ts",
                 "**/contracts/**",
-                "libs/shared/src/infrastructure/api-client.ts",
+                "**/infrastructure/api-client.ts",
                 "apps/behandelportal/src/main.ts",
                 "**/*.testing.ts",
                 "**/*.d.ts"
@@ -293,7 +293,7 @@
                 "**/*.spec.ts",
                 "**/*.stories.ts",
                 "**/contracts/**",
-                "src/infrastructure/api-client.ts",
+                "**/infrastructure/api-client.ts",
                 "src/test-entry.ts",
                 "**/*.testing.ts",
                 "**/*.d.ts"
@@ -332,6 +332,7 @@
                 "**/*.spec.ts",
                 "**/*.stories.ts",
                 "**/contracts/**",
+                "**/infrastructure/api-client.ts",
                 "src/test-entry.ts",
                 "**/*.testing.ts",
                 "**/*.d.ts"