chore: prepare netbird v0.3.2 release

[mikkeldamsgaard]

Summary

• Bump chart version 0.3.1 → 0.3.2
• Move unreleased CHANGELOG entries to [0.3.2] — 2026-03-28
• Update test assertions for new chart version

Included changes

• Bump NetBird appVersion from 0.66.4 to 0.67.0
• Bump Initium from 2.0.0 to 2.1.0 (database creation regression fix)
• Fix seed spec connection strings with URL-special characters (netbird: db-seed init container fails when database password contains URL-special characters #32)
• Bump appVersion from 0.66.3 to 0.66.4
• Bump Initium from 1.2.0 to 2.0.0

Test plan

• make test — all 295 tests pass (lint + unit)
• CI passes

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