Add Style::realName so scope names convert to tables at the SQL boundary

[alganet]

The mapper DSL used scope/method names verbatim as DB table names, forcing PHP-side code to submit to DB conventions (snake_case, plural) — the very thing Styles exist to prevent. The one identifier a Style was never consulted for was the table name.

Add Stylable::realName(scope): table, the missing symmetric partner of styledName(scope): class, completing the quadrant (styled*->PHP, real*->DB; *Name->entity, *Property->field). Standard delegates it to realProperty; remoteIdentifier and composed are now expressed through realProperty/realName so they convert their inputs too. InMemoryMapper routes table lookups through realName while keeping scope names as aliases.

Because realName is the single point of difference for pluralized tables, Plural collapses from three overrides to one (realName); class resolution, foreign keys, and junction names are now inherited from Standard unchanged.

All edits are no-ops on existing snake/plural names; scope-name flips live in the consuming projects.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.48%. Comparing base (6512ccc) to head (70d7fe6).

Additional details and impacted files

@@             Coverage Diff              @@
##             master      #33      +/-   ##
============================================
- Coverage     98.51%   98.48%   -0.03%     
+ Complexity      196      194       -2     
============================================
  Files            10       10              
  Lines           404      397       -7     
============================================
- Hits            398      391       -7     
  Misses            6        6              

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