chore: bump package version to 0.4.0

[vpcmps]

Summary

Release bookkeeping for 0.4.0. 0.3.0 is already on NuGet, so this is the next minor. The release itself is additive:

• Two new packages, Offside.OpenTelemetry and Offside.OpenTelemetry.MediatR (feat: add Offside.OpenTelemetry integration packages #19) — first publication, so this tag permanently claims those names.
• OffsideApplicationInsightsOptions.FormatMessage and DomainErrorMessageFormat, defaulting to the previous behaviour.

Changes here: bump Directory.Build.props to 0.4.0, close [Unreleased] into [0.4.0], and swap the two OpenTelemetry rows in the README from "Publication pending" to NuGet badges, since this tag is what publishes them.

Notes for the reviewer

The version in Directory.Build.props is only the local default — release.yml passes -p:Version from the tag name, so the tag is what actually decides. Keeping the file in step matters anyway for local dotnet pack and for anyone reading the repo to find out what version it is; it drifted to 0.2.0 while 0.3.0 shipped, which is part of what made the last release state hard to read.

## [Unreleased] is deliberately left in place, empty, above ## [0.4.0].

Validation

• dotnet restore --locked-mode
• dotnet build Offside.sln -c Release --no-restore — with -p:Version=0.4.0, 0 warnings
• dotnet test Offside.sln -c Release --no-build --no-restore — 26 assemblies green
• README and docs (docs/ + docs/pt-BR/) updated — README only; the guides landed in feat: add Offside.OpenTelemetry integration packages #19

dotnet pack -p:Version=0.4.0 produces all 13 nupkgs (plus snupkgs).

Compatibility

• No public API, package, or behavior change.
• Compatibility impact described below.

Version metadata only — no code changes in this PR. The release it tags is additive: no existing public API removed or changed, and FormatMessage defaults to the text existing hosts already get.

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Note

Low Risk
Documentation and version metadata only; no runtime or public API changes in this PR.

Overview
Prepares the 0.4.0 release in repo metadata only—no application code in this diff.

Bumps the shared package version in Directory.Build.props from 0.3.0 to 0.4.0 and adds a dated [0.4.0] changelog section (OpenTelemetry packages, Application Insights message formatting, docs) while leaving an empty [Unreleased] section for future work.

Updates README so Offside.OpenTelemetry and Offside.OpenTelemetry.MediatR are shown as published on NuGet (badges in the packages table) and drops the install-section note that those packages were not on NuGet yet.

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