Add final deployed frontend and backend binaries

final-build/README.md

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+# Final frontend and backend builds
+
+Release: `20260908-captcha-size-2` (2026-09-08)  
+Target: Linux ARM64
+
+| Component | Binary | Install path |
+| --- | --- | --- |
+| Frontend | `frontend/tera-clone-demo-web` | `/usr/bin/tera-clone-demo-web` |
+| Backend | `backend/tera-clone-demo-api` | `/usr/bin/tera-clone-demo-api` |
+
+These binaries match the deployed release on 192.168.0.223. The frontend includes the 4-digit CAPTCHA, inline countdown, and 140px image width.
+
+Verify file integrity from this directory with `sha256sum -c SHA256SUMS`. Install executable files with mode `0755`.
+
+This bundle contains only the web and API executables, not a complete firmware image. It requires the compatible device services and configuration already installed on the target. Runtime data, credentials, and private keys are not included. Source changes are not included in this binary-only commit.

final-build/SHA256SUMS

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+3e4197ba4075ccf959d4d2efc3ffd290c4e381e1cdf6814073b654d273aa678f  frontend/tera-clone-demo-web
+161e994766eec8f85fc11fc445fc7435a7e57bc613505df2d7327481b82d2477  backend/tera-clone-demo-api