Ormc v3 — Field v3 Migration + Permitted in Schema

[cdvelop]

The implementation follows the plan described in docs/PLAN.md. It migrates the ORM to github.com/tinywasm/fmt v0.19.0 (Field v3), introducing a new validation system.

Key changes:

1. ormc.go: Updated FieldInfo and ParseStruct to parse validate tags and omitempty from json tags. Removed form tag support.
2. Code Generation: ormc now generates a structured Schema() with Permitted and OmitEmpty fields. It also generates a composite Validate() method for each model that calls fmt.ValidateFielder(m) and format-specific validators from github.com/tinywasm/form.
3. db.go: Create and Update methods now call the model's Validate() method if it implements fmt.Validator.
4. Documentation: Updated docs/SKILL.md and docs/ARQUITECTURE.md to reflect the new validation and tag system.
5. Tests: Updated existing tests and added new test cases to verify the generation and execution of the new validation logic.

Verified with gotest (coverage: 90.4% of github.com/tinywasm/orm).

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PR created automatically by Jules for task 10026323555067253950 started by @cdvelop

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