refactor(i18n): rename vorlagen/ -> templates/, *-vorlage -> *-template

Final German naming cleanup in dev-process:
- vorlagen/                            -> templates/
- vorlagen-word/                       -> templates-word/
- tools/generate_word_vorlagen.sh      -> tools/generate_word_templates.sh
- *-vorlage.md / *-vorlage.docx        -> *-template.md / *-template.docx
- Review-Protokoll-vorlage.*           -> Review-Minutes-template.*
- angebot-vorlage.*                    -> quote-template.*
- angebot-beispiel.html                -> quote-example.html

All references in README.md, toolstack/toolstack.md, build_word_template.py,
and generate_word_templates.sh updated. The master Word style template
(slohmaier-doc-template.docx) was already English-named.

The dev-process repo is now fully English in both content and structure.

templates/quote-template.md

@@ -0,0 +1,76 @@
+<!-- slohmaier Engineering – Quotation template -->
+<!-- Use: replace {{ ... }} placeholders, then export with pandoc -->
+<!-- Export: pandoc angebot.md -o angebot.html --standalone -->
+<!-- Example: angebot-beispiel.html -->
+
+<div class="logo">
+  <img src="https://slohmaier.com/branding/logo-doc-light.svg" alt="slohmaier" class="logo-light" />
+  <img src="https://slohmaier.com/branding/logo-doc-dark.svg" alt="slohmaier" class="logo-dark" />
+</div>
+
+---
+
+# Quotation: {{ title }}
+
+**Date:** {{ date }}
+**Version:** 1.0
+**Project:** {{ project name }}
+**Client:** {{ client }}
+
+---
+
+## Summary
+
+{{ Short description of what is being offered }}
+
+---
+
+## Content
+
+### 1. Goal
+
+{{ What is to be achieved? }}
+
+### 2. Scope
+
+{{ What is included? List of services }}
+
+**Not included:** {{ What is explicitly excluded? }}
+
+### 3. Requirements
+
+| #   | Requirement | Priority   |
+|-----|-------------|------------|
+| 1   | ...         | Must       |
+| 2   | ...         | Should     |
+| 3   | ...         | Could      |
+
+### 4. Approach
+
+1. {{ Step 1 }}
+2. {{ Step 2 }}
+3. {{ Step 3 }}
+
+Estimated duration: **{{ duration }}**
+
+### 5. Open items
+
+- [ ] {{ Precondition 1 }}
+- [ ] {{ Precondition 2 }}
+
+### 6. Deliverable
+
+{{ What is delivered at the end? Format, scope }}
+
+---
+
+**Terms**
+
+Day rate: on request
+Payment terms: 14 days from invoice date
+Valid until: {{ date + 14 days }}
+
+---
+
+**Stefan Lohmaier**
+slohmaier.com · stefan@slohmaier.de