fix(config): preserve colons in variable substitution default values

[skevetter]

Summary

• Fix variable substitution bug where ${localEnv:VAR:http://proxy:8080} was truncated to just http because args[1] only took the first segment after splitting on colons. Now uses strings.Join(args[1:], ":") to rejoin the full default value.
• Add unit tests for lookupValue covering set/unset vars, simple defaults, and colon-containing defaults, plus an end-to-end ResolveString test.
• Add e2e test verifying default substitution in a real workspace with both simple and colon-containing defaults.

Fixes #9

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📥 Commits

Reviewing files that changed from the base of the PR and between 893db05 and ddfc1a4.

📒 Files selected for processing (4)

• e2e/tests/up/provider_docker.go
• e2e/tests/up/testdata/docker-variables-defaults/.devcontainer.json
• pkg/devcontainer/config/substitute.go
• pkg/devcontainer/config/substitute_test.go

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