feat: schema system rewrite — ruamel.yaml, Pydantic validation, CI enforcement

Core improvements:
- generate_schema.py: migrate comment extraction from hand-rolled 200-line
  regex scanner to ruamel.yaml (preserves comments natively via CommentToken)
- extract_unit(): add = guard to reject parentheticals like (lower = less CPU)
- config_validator.py (new): thin Pydantic validation for Safety.GlobalLimits
  and VideoSource at startup — non-blocking, logs WARNING only
- parameters.py: call validate_safety_config() after config load
- schemaAnalyzer.js: fix minimum/maximum → min/max naming drift bug
  (SmartValueEditor now shows bounds for nested object/array fields)

CI & docs:
- .pre-commit-config.yaml (new): schema-sync-check hook regenerates schema
  on config_default.yaml changes and blocks commit if out of sync
- scripts/check_schema.sh (new): standalone CI sync-check script
- scripts/SCHEMA_COMMENT_CONVENTIONS.md (new): structured comment patterns doc

Tests:
- test_generate_schema.py: +11 new tests for extract_unit(), parse_config_with_comments(),
  and validate_safety_config() — 25 tests total, all pass

Results: 1558 passed, 49 skipped, 0 failed

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: alireza787b

.pre-commit-config.yaml

@@ -0,0 +1,32 @@
+# .pre-commit-config.yaml
+# Pre-commit hooks for PixEagle
+#
+# Install: pip install pre-commit && pre-commit install
+# Run manually: pre-commit run --all-files
+#
+# Schema sync hook: runs generate_schema.py whenever config_default.yaml changes.
+# If the schema is out of date, the commit is blocked with an error message.
+
+repos:
+  - repo: local
+    hooks:
+      - id: schema-sync-check
+        name: Config schema must be up-to-date
+        language: python
+        additional_dependencies: [pyyaml, ruamel.yaml]
+        entry: python scripts/generate_schema.py
+        pass_filenames: false
+        files: '^configs/config_default\.yaml$'
+        stages: [commit]
+
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.5.0
+    hooks:
+      - id: trailing-whitespace
+        exclude: '^docs/'
+      - id: end-of-file-fixer
+        exclude: '^docs/'
+      - id: check-yaml
+        args: [--unsafe]  # Allow YAML with anchors/aliases
+      - id: check-json
+      - id: check-merge-conflict