Add Fowler patterns (PEAA) semantic anchor

[Copilot]

Adds semantic anchor for Martin Fowler's "Patterns of Enterprise Application Architecture" (PEAA, 2002), commonly referred to as "Fowler patterns."

Changes

• New anchor: fowler-patterns.adoc + German translation
• Category: design-principles
• Roles: software-architect, software-developer, team-lead
• Related: domain-driven-design, hexagonal-architecture, clean-architecture

Coverage

Includes all 10 PEAA pattern categories:

• Domain Logic (Transaction Script, Domain Model, Service Layer)
• Data Source Architectural (Active Record, Data Mapper, Table/Row Data Gateway)
• Object-Relational Behavioral (Unit of Work, Identity Map, Lazy Load)
• Object-Relational Structural (Identity Field, Foreign Key Mapping, Inheritance patterns)
• Object-Relational Metadata (Repository, Query Object)
• Web Presentation (MVC, Page/Front Controller, Template/Transform View)
• Distribution (Remote Facade, DTO)
• Offline Concurrency (Optimistic/Pessimistic Locks)
• Session State (Client/Server/Database)
• Base Patterns (Gateway, Mapper, Registry, Value Object)

Screenshot

Search integration verified:

Original prompt

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This section details on the original issue you should resolve

<issue_title>[Anchor Proposal]: Fowler patterns</issue_title>
<issue_description>### Proposed Term

Fowler patterns

Context (Optional)

No response

Pre-submission Checklist

• I have searched existing anchors and this term is not already included
• This term refers to a well-established concept (not something I invented)</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes [Anchor Proposal]: Fowler patterns #99

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