Add SI-prefix-aware sorting column for parts tableFeature/si value sort

[wschopohl]

Summary

• Adds an optional "SI Value" column to the parts table that parses numeric values with SI prefixes (p, n, u/µ, m, k/K, M, G, T) from part names and sorts by the resulting physical value
• Useful for electronic components where alphabetical sorting produces wrong results — e.g. 100nF, 10pF, 1uF sort as 10pF < 100nF < 1uF
• The column displays the parsed float value, or an empty cell for non-matching names
• Only matches numbers at the start of the name — part numbers like "MCP2515" or "Crystal 20MHz" are not affected
• Supports both dot and comma decimal separators (European locale)
• Falls back to NATSORT for parts without SI values, so they sort alphabetically rather than arbitrarily
• Opt-in: not in default columns, users enable it via the column visibility button

Implementation

• New SiValueSort DQL function with platform-specific SQL for PostgreSQL (POSIX regex), MySQL/MariaDB (REGEXP_SUBSTR), and SQLite (PHP callback via the existing middleware)
• 33 unit tests covering all platforms, SI prefixes, edge cases, and sort order verification

Test plan

• Unit tests pass (33 tests, all platforms)
• PHPStan level 2 passes
• Tested against real parts database with SQLite

[wschopohl]

For completeness, here is a screenshot showing how SI Value improves table ordering. It uses the value from 'Name' under the hood, extracting leading numbers with SI prefixes.

[codecov]

Codecov Report

❌ Patch coverage is 85.91549% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 57.14%. Comparing base (5b86d6f) to head (93b9b29).
⚠️ Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
src/Doctrine/Functions/SiValueSort.php	88.67%	6 Missing ⚠️
src/DataTables/PartsDataTable.php	76.47%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1344      +/-   ##
============================================
+ Coverage     57.08%   57.14%   +0.05%     
- Complexity     8381     8398      +17     
============================================
  Files           615      616       +1     
  Lines         26994    27065      +71     
============================================
+ Hits          15410    15465      +55     
- Misses        11584    11600      +16     

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[jbtronics]

Looks good. Thanks.
That should be quite useful.

[wschopohl]

Awesome and thanks for fixing the PHPStan issue - must have slipped my attention