docs: add Protocol Buffers integration guide

[easyhooon]

Summary

• add dedicated English and Korean Protocol Buffers pages to the documentation sidebar
• clarify that protobuf inspection has no feature flag and is enabled through the decoder overload and protobuf capture methods
• document decoder setup, all request/response directions, request ID pairing, Base64 transport, raw capture limits, and runtime behavior
• show the Decoded and Raw views with light-mode screenshots and explain that both views are available for REQUEST and RESPONSE
• link the full guides from the README and keep the interceptor API pages concise

Validation

• npm run build in documentation/
• verified /docs/protobuf and /ko/docs/protobuf static output and public image assets
• pre-commit detekt and ktlint checks

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 561930ba-0326-4382-b83e-0af74bfb0a9e

📥 Commits

Reviewing files that changed from the base of the PR and between 8196d7d and db32461.

⛔ Files ignored due to path filters (2)

• documentation/public/protobuf-decoded.png is excluded by !**/*.png
• documentation/public/protobuf-raw.png is excluded by !**/*.png

📒 Files selected for processing (7)

• README.md
• documentation/content/docs/interceptor.mdx
• documentation/content/docs/ko/interceptor.mdx
• documentation/content/docs/ko/meta.json
• documentation/content/docs/ko/protobuf.mdx
• documentation/content/docs/meta.json
• documentation/content/docs/protobuf.mdx

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