chore(deps): upgrade all dependencies, Go runtime, and Docker images to latest versions

[CybotTM]

Summary

Complete dependency upgrade bringing all components to their latest stable versions:

• ✅ Go runtime: 1.24.0 → 1.25.1
• ✅ Docker base images: golang:1.25.1-alpine, alpine:3.22.1
• ✅ Direct dependency: simple-ldap-go v1.0.3 → v1.2.0
• ✅ All indirect dependencies updated (fasthttp, brotli, compress, testify, etc.)

Changes

Runtime Environment

• Go: 1.24.0 → 1.25.1 (latest stable)
• go.mod directive: Updated to 1.25.1
• Dockerfile golang: 1.25-alpine → 1.25.1-alpine
• Dockerfile alpine: 3.22 → 3.22.1

Direct Dependencies

• netresearch/simple-ldap-go: v1.0.3 → v1.2.0

Major Indirect Dependencies

• valyala/fasthttp: v1.51.0 → v1.66.0 (15 versions)
• rivo/uniseg: v0.2.0 → v0.4.7 (major update)
• andybalholm/brotli: v1.1.0 → v1.2.0
• klauspost/compress: v1.17.9 → v1.18.0
• stretchr/testify: v1.10.0 → v1.11.1

New Transitive Dependencies

• testcontainers/testcontainers-go v0.39.0 (testing infrastructure)
• OpenTelemetry instrumentation packages
• Docker/Moby ecosystem packages

Breaking Changes Fixed

simple-ldap-go v1.2.0 reverted API from pointer to value for Config:

• ✅ Fixed ldap.New() calls in internal/server/service.go:26
• ✅ Fixed ldap.New() calls in internal/server/auth_middleware_test.go:173

Test Plan

• go fmt - Passed
• go vet - Passed
• golangci-lint run - 0 issues
• typecheck - Passed
• test-short - Passed (5 unit tests)
• test - Passed (all tests, 4 integration properly skipped)
• build - Binary created successfully
• go mod verify - All modules verified

Files Changed

• Dockerfile - Updated Go and Alpine versions
• go.mod - Updated go directive and dependencies
• go.sum - Cleaned up checksums (231 insertions, 461 deletions)

All quality checks passing ✅