[v3.3.0] Stable release feedback

[FUjr]

Release tag: v3.3.0
Source branch: stable
Release commit: e66cbde

Please report v3.3.0 regressions here first. Include router/modem model, QModem commit, reproduction steps, and redacted logs. Do not include IMEI, IMSI, ICCID, phone numbers, credentials, or SMS content.

Migration notes: https://github.com/FUjr/QModem/blob/main/docs/release/version-migration.zh-cn.md

[FUjr]

Tag v3.3.0 was finalized at stable commit 5cc80e5. Functional stable code remains based on aa03cfd plus the external bridge change; later commits are CI/Wiki release metadata.