Upgrade baton-sdk to v0.7.4 and Go to 1.25.2

[gontzess]

Summary

• Upgrade baton-sdk to v0.7.4
• Upgrade Go to 1.25.2
• Add config generation with go generate following baton-datadog pattern
• Update Makefile with GENERATED_CONF, BUILD_TAGS, and generate target
• Migrate from viper to typed config struct

CI Status

• go-lint: ✅ Pass
• go-test: ✅ Pass
• test: ✅ Pass

🤖 Generated with Claude Code

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