Add SI-prefix-aware sorting column for the parts table

Adds an optional "Name (SI)" column 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. This is useful for electronic components where
alphabetical sorting produces wrong results — e.g. 100nF, 10pF, 1uF
should sort as 10pF < 100nF < 1uF.

Implementation:
- New SiValueSort DQL function with platform-specific SQL generation
  for PostgreSQL (POSIX regex), MySQL/MariaDB (REGEXP_SUBSTR), and
  SQLite (PHP callback registered via the existing middleware).
- The regex is start-anchored: only names beginning with a number are
  matched. Part numbers like "MCP2515" or "Crystal 20MHz" are ignored.
- When SI sort is active, NATSORT is appended as a secondary sort so
  that non-matching parts fall back to natural string ordering instead
  of appearing in arbitrary order.
- The column is opt-in (not in default columns) and displays the parsed
  float value, or an empty cell for non-matching names.

src/Settings/BehaviorSettings/PartTableColumns.php

@@ -52,6 +52,8 @@ enum PartTableColumns : string implements TranslatableInterface
     case TAGS = "tags";
     case ATTACHMENTS = "attachments";
 
+    case SI_NAME = "si_name";
+
     case EDA_REFERENCE = "eda_reference";
 
     case EDA_VALUE = "eda_value";
@@ -67,6 +69,7 @@ enum PartTableColumns : string implements TranslatableInterface
             self::NEEDS_REVIEW => 'part.table.needsReview',
             self::MANUFACTURING_STATUS => 'part.table.manufacturingStatus',
             self::MPN => 'part.table.mpn',
+            self::SI_NAME => 'part.table.si_name',
             default => 'part.table.' . $this->value,
         };