docs: archive outdated reports and organize references

Archived several outdated reports (`Ping-Service_Impl_01-2026.md`, `Frontend_Integration_Status.md`, etc.) and added archival notes and references to updated documents. Introduced a centralized reference structure for tech stack documentation, consolidating files under `01_Architecture/Reference/Tech_Stack`. Added new resources (`Gradle_Kotlin_DSL_Primer`, `Kotlin_2-3-0_ReleaseNotes`) for improved project organization and clarity.
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+---
+type: Reference
+status: ACTIVE
+owner: Lead Architect
+tags: [kotlin, release-notes, tech-stack]
+---
+
+# What's new in Kotlin 2.3.0
+
+**Quelle:** [Original Kotlin Documentation](https://kotlinlang.org/docs/whatsnew23.html)
+**Datum des Dokuments:** 16. Dezember 2025
+**Kontext:** Dieses Dokument dient als Referenz für die im Projekt verwendete Kotlin-Version.
+
+---
+
+The Kotlin 2.3.0 release is out! Here are the main highlights:
+
+*   **Language:** More stable and default features, unused return value checker, explicit backing fields, and changes to context-sensitive resolution.
+*   **Kotlin/JVM:** Support for Java 25.
+*   **Kotlin/Native:** Improved interop through Swift export, faster build time for release tasks, C and Objective-C library import in Beta.
+*   **Kotlin/Wasm:** Fully qualified names and new exception handling proposal enabled by default, as well as new compact storage for Latin-1 characters.
+*   **Kotlin/JS:** New experimental suspend function export, `LongArray` representation, unified companion object access, and more.
+*   **Gradle:** Compatibility with Gradle 9.0 and a new API for registering generated sources.
+*   **Compose compiler:** Stack traces for minified Android applications.
+*   **Standard library:** Stable time tracking functionality and improved UUID generation and parsing.
+
+## Language
+
+Kotlin 2.3.0 focuses on feature stabilization, introduces a new mechanism for detecting unused return values, and improves context-sensitive resolution.
+
+### Stable features
+
+The following features have now graduated to Stable:
+*   Support for nested type aliases
+*   Data-flow-based exhaustiveness checks for `when` expressions
+
+### Features enabled by default
+*   Support for `return` statements in expression bodies with explicit return types is now enabled by default.
+
+### Experimental: Unused return value checker
+Kotlin 2.3.0 introduces the unused return value checker to help prevent ignored results.
+
+### Experimental: Explicit backing fields
+A new syntax for explicitly declaring the underlying field that holds a property's value, simplifying the common backing properties pattern.
+
+## Kotlin/JVM: Support for Java 25
+Starting with Kotlin 2.3.0, the compiler can generate classes containing Java 25 bytecode.
+
+## Kotlin/Native
+*   **Improved Swift Export:** Direct mapping for native enum classes and variadic function parameters.
+*   **C and Objective-C Library Import is in Beta:** Better diagnostics for binary compatibility issues.
+*   **Faster Build Time:** Up to 40% faster release builds, especially for iOS targets.
+
+## Kotlin/Wasm
+*   **Fully Qualified Names Enabled by Default:** `KClass.qualifiedName` is now available at runtime without extra configuration.
+*   **Compact Storage for Latin-1 Characters:** Reduces metadata and binary size.
+*   **New Exception Handling for `wasmWasi`:** Enabled by default for better compatibility with modern WebAssembly runtimes.
+
+## Kotlin/JS
+*   **Experimental Suspend Function Export:** Export suspend functions directly to JavaScript using `@JsExport`.
+*   **`BigInt64Array` for `LongArray`:** Simplifies interop with JavaScript APIs that use typed arrays.
+*   **Unified Companion Object Access:** Consistent access to companion objects in interfaces across all JS module systems.
+
+## Gradle
+*   Fully compatible with Gradle 7.6.3 through 9.0.0.
+*   New experimental API for registering generated sources.
+
+## Standard library
+*   **Stable Time Tracking:** `kotlin.time.Clock` and `kotlin.time.Instant` are now stable.
+*   **Improved UUID Generation:** New functions like `Uuid.parseOrNull()`, `Uuid.generateV4()`, and `Uuid.generateV7()`.
+
+## Compose compiler
+*   **Stack Traces for Minified Android Apps:** The compiler now outputs ProGuard mappings for Compose stack traces when applications are minified by R8.