fix(deploy): validate target boot layout

[mchave3]

Summary

Validate the actual target disk layout after DiskPart and the required inputs immediately before BCDBoot.

Reason

A successful DiskPart exit code did not prove that the target ESP and Windows volumes were usable, and BCDBoot failures lacked prerequisite-specific diagnostics.

Main changes

• increase the ESP from 260 MiB to 300 MiB
• refresh and retry WinPE Storage discovery for up to 30 seconds after DiskPart
• verify GPT, same-disk partition ownership, EFI GPT type, FAT32, assigned letter, ESP size, and NTFS Windows/recovery volumes
• verify BCDBoot, BCD-Template, ESP accessibility, and ESP writability before execution
• localize all new validation and failure messages in all 38 supported cultures
• add regression coverage for retry behavior, invalid GPT/ESP/JSON, missing boot prerequisites, and localization presence

Testing

• x64 Foundry.Deploy.Tests: 379 passed
• ARM64 Foundry.Deploy build: passed
• repository format verification: passed

Merge order

Merge PR #259 first, then synchronize this branch with main before merging because both PRs extend the localization resources.

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