docs: Standardize Go version requirement to 1.25.5+ throughout documentation

- Update CONTRIBUTING.md to require Go 1.25.5 or later
- Update README.md prerequisites
- Update GETTING-STARTED.md requirements
- Update Dockerfile examples to use golang:1.25-alpine
- Update issue templates to reflect supported Go versions
- Ensure consistency across all documentation files

All CI workflows already use go-version-file: go.mod so they
automatically pick up the correct version from go.mod.

.github/ISSUE_TEMPLATE/bug_report.md

@@ -22,7 +22,7 @@ A clear and concise description of what you expected to happen.
 
 **Environment (please complete the following information):**
 - OS: [e.g. macOS 14.0, Windows 11, Ubuntu 22.04]
-- Go version: [e.g. 1.21.5]
+- Go version: [e.g. 1.25.5]
 - Library version: [e.g. v1.0.0, commit hash if using main branch]
 - SoundTouch device model: [e.g. SoundTouch 10, SoundTouch 20]
 - Device firmware version: [if known]

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -24,10 +24,10 @@ body:
       label: Go Version
       description: What version of Go are you using?
       options:
+        - "1.25.5+"
+        - "1.25"
+        - "1.24"
         - "1.23"
-        - "1.22"
-        - "1.21"
-        - "1.20"
         - "Other (please specify in description)"
     validations:
       required: true

.github/ISSUE_TEMPLATE/device_compatibility.md

@@ -76,7 +76,7 @@ soundtouch-cli --host 192.168.1.100 play start
 
 **Environment**
 - **OS**: [e.g. macOS 14.0, Windows 11, Ubuntu 22.04]
-- **Go version**: [e.g. 1.21.5]
+- **Go version**: [e.g. 1.25.5]
 - **Library version**: [e.g. v1.0.0, commit hash]
 - **Network setup**: [home WiFi, corporate, etc.]
 

CONTRIBUTING.md

@@ -24,7 +24,7 @@ This project adheres to our [Code of Conduct](CODE_OF_CONDUCT.md). By participat
 
 ### Prerequisites
 
-- **Go 1.21 or later**: [Download Go](https://golang.org/dl/)
+- **Go 1.25.5 or later**: [Download Go](https://golang.org/dl/)
 - **Git**: For version control
 - **Make**: For build automation (optional but recommended)
 - **SoundTouch Device**: For testing (optional but valuable)

README.md

@@ -241,7 +241,7 @@ This library supports all Bose SoundTouch-compatible devices, including:
 ## Development
 
 ### Prerequisites
-- Go 1.21 or later
+- Go 1.25.5 or later
 - Optional: SoundTouch device for testing
 
 ### Building from Source

docs/DEPLOYMENT.md

@@ -786,7 +786,7 @@ func (app *Application) Run(ctx context.Context) error {
 
 ```dockerfile
 # Dockerfile
-FROM golang:1.21-alpine AS builder
+FROM golang:1.25-alpine AS builder
 
 WORKDIR /app
 COPY go.mod go.sum ./

docs/GETTING-STARTED.md

@@ -6,7 +6,7 @@ This guide will get you up and running with the SoundTouch Go client in under 10
 
 ## 📋 **Prerequisites**
 
-- **Go 1.19 or later** installed on your system
+- **Go 1.25.5 or later** installed on your system
 - **Bose SoundTouch device** on your network (SoundTouch 10, 20, 30, etc.)
 - **Same network** - Your computer and SoundTouch device must be on the same network
 

docs/PROJECT-PATTERNS.md

@@ -562,7 +562,7 @@ func (m *MockClient) GetNowPlaying() (*models.NowPlaying, error) {
 
 ```dockerfile
 # test/docker/Dockerfile
-FROM golang:1.21-alpine
+FROM golang:1.25-alpine
 
 WORKDIR /app
 COPY . .