📝 Add GitHub Issue Templates (Bug/Feature/Question)

- Bug report template with system info and reproduction steps
- Feature request template with priority selection
- Question template with documentation checklist
- Config with links to docs and troubleshooting
- All templates bilingual (DE/EN)

[skip ci]

.github/ISSUE_TEMPLATE/bug_report.yml

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+---
+name: Bug Report / Fehlerbericht
+about: Melde einen Fehler in der App / Report a bug in the app
+title: '[BUG] '
+labels: bug
+assignees: ''
+
+---
+
+## 🐛 Beschreibung / Description
+
+<!-- Kurze Beschreibung des Problems / Brief description of the problem -->
+
+---
+
+## 📱 Systeminfo / System Info
+
+- **Android Version:** (z.B. / e.g. Android 13)
+- **App Version:** (z.B. / e.g. v1.1.0)
+- **Gerät / Device:** (z.B. / e.g. Samsung Galaxy S21)
+
+---
+
+## 🔄 Schritte zum Reproduzieren / Steps to Reproduce
+
+1. 
+2. 
+3. 
+
+---
+
+## ✅ Erwartetes Verhalten / Expected Behavior
+
+<!-- Was sollte passieren? / What should happen? -->
+
+---
+
+## ❌ Tatsächliches Verhalten / Actual Behavior
+
+<!-- Was passiert stattdessen? / What happens instead? -->
+
+---
+
+## 📸 Screenshots / Logs
+
+<!-- Falls vorhanden / If available -->
+
+<details>
+<summary>LogCat (optional)</summary>
+
+```
+Füge hier LogCat Output ein / Paste LogCat output here
+```
+
+</details>
+
+---
+
+## 🔧 Zusätzliche Informationen / Additional Context
+
+<!-- Z.B. Server-Konfiguration, Netzwerk-Setup, etc. / E.g. server config, network setup, etc. -->

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: 📖 Dokumentation / Documentation
+    url: https://github.com/inventory69/simple-notes-sync/blob/main/README.md
+    about: Schau zuerst in die Dokumentation / Check documentation first
+  - name: 🚀 Quick Start Guide
+    url: https://github.com/inventory69/simple-notes-sync/blob/main/QUICKSTART.md
+    about: Schritt-für-Schritt Anleitung / Step-by-step guide
+  - name: 🐛 Troubleshooting
+    url: https://github.com/inventory69/simple-notes-sync/blob/main/QUICKSTART.md#troubleshooting
+    about: Häufige Probleme und Lösungen / Common issues and solutions

.github/ISSUE_TEMPLATE/feature_request.yml

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+---
+name: Feature Request / Feature-Wunsch
+about: Schlage eine neue Funktion vor / Suggest a new feature
+title: '[FEATURE] '
+labels: enhancement
+assignees: ''
+
+---
+
+## 💡 Feature-Beschreibung / Feature Description
+
+<!-- Was möchtest du hinzugefügt haben? / What would you like to be added? -->
+
+---
+
+## 🎯 Problem / Motivation
+
+<!-- Welches Problem würde dieses Feature lösen? / What problem would this feature solve? -->
+
+---
+
+## 📝 Vorgeschlagene Lösung / Proposed Solution
+
+<!-- Wie könnte das Feature funktionieren? / How could the feature work? -->
+
+---
+
+## 🔄 Alternativen / Alternatives
+
+<!-- Hast du andere Lösungsansätze in Betracht gezogen? / Have you considered other solutions? -->
+
+---
+
+## 📱 Plattform / Platform
+
+- [ ] Android App
+- [ ] WebDAV Server
+- [ ] Dokumentation / Documentation
+- [ ] Andere / Other: ___________
+
+---
+
+## 🌟 Priorität (aus deiner Sicht) / Priority (from your perspective)
+
+- [ ] Nice to have
+- [ ] Wichtig / Important
+- [ ] Kritisch / Critical
+
+---
+
+## 🔧 Zusätzliche Informationen / Additional Context
+
+<!-- Screenshots, Mockups, Links, etc. -->

.github/ISSUE_TEMPLATE/question.yml

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+---
+name: Question / Frage
+about: Stelle eine Frage zur Nutzung / Ask a question about usage
+title: '[QUESTION] '
+labels: question
+assignees: ''
+
+---
+
+## ❓ Frage / Question
+
+<!-- Deine Frage hier / Your question here -->
+
+---
+
+## 🔍 Was hast du bereits versucht? / What have you already tried?
+
+<!-- Hast du die Dokumentation gelesen? / Have you read the documentation? -->
+
+- [ ] [Quick Start Guide](https://github.com/inventory69/simple-notes-sync/blob/main/QUICKSTART.md) gelesen / read
+- [ ] [Troubleshooting](https://github.com/inventory69/simple-notes-sync/blob/main/QUICKSTART.md#troubleshooting) durchgearbeitet / checked
+- [ ] [DOCS.md](https://github.com/inventory69/simple-notes-sync/blob/main/DOCS.md) gelesen / read
+
+---
+
+## 📱 Kontext / Context
+
+<!-- Z.B. Server-Setup, Android Version, etc. / E.g. server setup, Android version, etc. -->
+
+---
+
+## 🔧 Zusätzliche Informationen / Additional Information
+
+<!-- Screenshots, Config-Dateien (ohne Passwörter!), etc. / Screenshots, config files (without passwords!), etc. -->