feat(android): establish Roubao build baseline

android-buyer/UPSTREAM.md

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+# Roubao Upstream Baseline
+
+- Repository: https://github.com/Turbo1123/roubao
+- Imported branch: `main`
+- Imported commit: `c8a6d7f03422eb01744b01f3ee77bf7757741f7e`
+- Imported on: 2026-07-25
+- Upstream license: MIT; see `LICENSE`
+
+The source was imported as a vendored snapshot without the upstream `.git`
+directory. Local changes are tracked by the parent `cmroubao` repository.
+
+## Baseline Adjustments
+
+Firebase Analytics and Crashlytics were removed from the imported baseline.
+The upstream repository does not include `google-services.json`, and telemetry
+is not required for the procurement feasibility probe. Local crash logs remain
+available through the existing `CrashHandler`.
+
+The upstream `roubao2.0+AccessibilityService` branch is not the imported
+baseline. Its accessibility implementation must be evaluated and ported in a
+separate task after this baseline builds successfully.