Add LC760CA GNSS module support

[Quency-D]

Summary

Add support for detecting and initializing the LC760CA GNSS module.

Changes

• Add GNSS_MODEL_LC760CA as a distinct GNSS model.
• Detect LC760CA modules through the Unicore probe flow using the $PDTINFO response signature $PDTINFO,CC1161W,.
• Add an LC760CA-specific cached-probe presence check using $PDTINFO,*62.
• Configure LC760CA modules to output the required GGA and RMC NMEA sentences, using the same $CFGMSG initialization flow as CM121 modules.

🤝 Attestations

• I have tested that my proposed changes behave as described.
• I have tested that my proposed changes do not cause any obvious regressions on the following devices:
  • Heltec (Lora32) V4

Summary by CodeRabbit

• New Features
  • Added support for detecting and initializing LC760CA GNSS receivers.
  • Added LC760CA as a recognized GNSS model.
  • Improved receiver verification using LC760CA identification responses.
  • Expanded compatibility with Unicore-family receiver detection.

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📥 Commits

Reviewing files that changed from the base of the PR and between 504e318 and 558bf7f.

📒 Files selected for processing (2)

• src/gps/GPS.cpp
• src/gps/GPS.h

🚧 Files skipped from review as they are similar to previous changes (2)

• src/gps/GPS.h
• src/gps/GPS.cpp

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📝 Walkthrough

Walkthrough

The GPS subsystem adds LC760CA as a recognized GNSS model. It verifies and detects LC760CA through $PDTINFO responses and applies the existing CM121 initialization commands.

Changes

LC760CA GPS support

Layer / File(s)	Summary
LC760CA model contract src/gps/GPS.h	Adds GNSS_MODEL_LC760CA to GnssModel_t.
LC760CA probing and initialization src/gps/GPS.cpp	Verifies cached LC760CA probes with $PDTINFO,*62, maps $PDTINFO,CC1161W, to the new model, and includes LC760CA in the CM121 initialization branch.

Estimated code review effort: 2 (Simple) | ~10 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: adding LC760CA GNSS module support.
Description check	✅ Passed	The description explains the implementation, detection flow, initialization changes, and testing status, with the required attestation section completed.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@src/gps/GPS.h`:
- Line 46: Preserve the existing numeric values in the GnssModel_t enum by
moving GNSS_MODEL_LC760CA after GNSS_MODEL_GENERIC_NMEA; keep
GNSS_MODEL_GENERIC_NMEA at its current value so GPSProbeCacheRecord decoding and
isValidGnssModel() remain compatible with existing probe-cache records.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

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Run ID: f0486dde-75bf-4a1c-b931-4a593b89fb61

📥 Commits

Reviewing files that changed from the base of the PR and between 6367132 and 504e318.

📒 Files selected for processing (2)

• src/gps/GPS.cpp
• src/gps/GPS.h