[Enhance]: Relax collection, field, and document ID name validation

[JalinWang]

Affected Component

DB

Current Behavior

The current name validation rules are very restrictive:

const std::regex COLLECTION_NAME_REGEX("^[a-zA-Z0-9_-]{3,64}$");

const std::regex FIELD_NAME_REGEX("^[a-zA-Z0-9_-]{1,32}$");

const std::regex DOC_PK_REGEX("^[a-zA-Z0-9_!@#$%+=.-]{1,64}$");

I don't see enough reasons to have such restrictions.

Desired Improvement

Lifting or relaxing these restrictions, or making them configurable, for:

• collection names
• field names
• document primary keys / IDs

A more permissive validation rule, or a user-configurable validator, would make Zvec easier to adopt in heterogeneous environments.

Impact

• Better compatibility with existing datasets and external identifiers
• Easier migration from other storage systems
• Reduced need for application-side name rewriting or ID normalization
• Less friction when integrating Zvec with multi-language tooling