docs(common): add conventional commits guideline and environment config to AGENTS.md

- Add dedicated Conventional Commits section with types and examples
- Document environment.ts as API URL configuration source
- Add to important files table

AGENTS.md

@@ -28,6 +28,7 @@ Energiegemeinschaftsverwaltung, Mitgliedschaften und Tarife.
 - API-Client wird aus OpenAPI-Spec generiert (`npm run generate-api`)
 - Test-Framework: Vitest
 - Code-Style: Prettier (100 Zeichen, Single Quotes, Angular HTML Parser)
+- API-URL über `src/environments/environment.ts` konfigurierbar (nicht hardcodiert)
 
 ## Entwicklung starten
 
@@ -117,6 +118,7 @@ NEW → WAITING_FOR_CONSENT → CONSENT_GRANTED → ACTIVE
 | `eeg_backend/.../iam/config/AdminDataInitializer.java` | Initialer Admin-User (dev) |
 | `eeg_backend/.../OpenApiGeneratorTest.java` | Generiert OpenAPI-Spec |
 | `eeg_frontend/openapi.yaml` | API-Vertrag für Frontend-Generierung |
+| `eeg_frontend/src/environments/environment.ts` | API-URL Konfiguration |
 | `eeg_frontend/src/app/app.routes.ts` | Frontend-Routing (alle Pages) |
 
 ## Regeln
@@ -125,3 +127,32 @@ NEW → WAITING_FOR_CONSENT → CONSENT_GRANTED → ACTIVE
 - Explizite `isEnabled()`-Überschreibung in `User.java` nötig (Lombok/Spring Security Konflikt)
 - Conventional Commits: `<type>(<scope>): <description>` (feat/fix/docs/style/refactor/test/chore)
 - Scopes: `iam`, `community`, `mako`, `tariff`, `dashboard`, `common`, `frontend`
+
+## Conventional Commits
+
+Ab jetzt werden [Conventional Commits](https://www.conventionalcommits.org/) verwendet:
+
+```
+<type>(<scope>): <description>
+
+[optional body]
+
+[optional footer]
+```
+
+### Typen
+- `feat`: Neue Funktion
+- `fix`: Bugfix
+- `docs`: Dokumentation
+- `style`: Formatierung (keine Code-Änderung)
+- `refactor`: Code-Refactoring ohne Funktionsänderung
+- `test`: Tests hinzugefügt/ergänzt
+- `chore`: Build-Prozess, Abhängigkeiten, Konfiguration
+
+### Beispiele
+```
+feat(iam): add user profile management
+fix(mako): handle consent rejected event correctly
+docs: update AGENTS.md with conventional commits
+test(iam): add UserService unit tests
+```