Perception: add preflight check for missing camera calibration files

[ishitadatta]

Summary

Add a perception preflight checker that fails fast when required camera calibration files are missing, instead of letting perception modules fail later at runtime.

Problem

Apollo perception startup repeatedly fails with errors like:

• Failed to load camera intrinsic: ..._intrinsics.yaml

This pattern appears in multiple issues, including:

• Apollo10.0感知模块启动launch文件报错Failed to load camera intrinsic:modules/perception/data/params/onsemi obstacle intrinsics.yaml #15665
• 9.0 perception launch error, Failed to load camera intrinsic: .../onsemi_obstacle_intrinsics.yaml #15248
• Perception Traffic Light module run failed #15591
• perception: camera_obstacle module run failed #15698

What this PR changes

• Adds scripts/perception_preflight_check.py.
  • Resolves sensor_meta.pb.txt similarly to runtime config resolution via APOLLO_CONF_PATH.
  • Parses camera sensors from sensor meta.
  • Validates required {sensor}_intrinsics.yaml and {sensor}_extrinsics.yaml files.
  • Prints actionable missing-path diagnostics and returns non-zero on failure.
• Updates scripts/perception.sh to run the preflight before launching perception.
  • Includes escape hatch: APOLLO_SKIP_PERCEPTION_PREFLIGHT=1.

Validation

• Positive run against repository config:
  • preflight reports OK for configured camera sensors.
• Negative run with synthetic missing sensor files:
  • preflight returns exit code 1 and prints missing file list.

Impact

This improves perception startup reliability and operator feedback by converting recurring runtime initialization failures into clear pre-launch validation errors.

[CLAassistant]

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