chore: remove VPC feature from CLI

[tejaskash]

Summary

• Reverts 3 VPC feature commits that were merged to main — the related feature-branch PRs (TUI wizard, template conditionals) were already discarded
• Removes VPC CLI flags from create and add commands, VPC info messages from dev and invoke, and VPC schema additions
• Deletes src/cli/commands/shared/vpc-utils.ts entirely
• Keeps expected pre-existing references: VpcConfigSchema in deployed-state.ts (CDK state tracking) and NetworkModeSchema = ['PUBLIC', 'PRIVATE'] in constants.ts

Approach

Three individual git revert commits (kept separate for traceability):

1. Revert c75f4cd — VPC CLI flags (create/add commands, 14 files)
2. Revert 7a81b02 — VPC info messages (dev/invoke, 2 files)
3. Revert 4180646 — VPC schema changes (7 files)

Test plan

• npm test — 149 test files passed (1756 tests, 0 failures)
• npm run build — TypeScript compilation + CLI bundle succeeds
• Grep verification: no residual networkConfig, NetworkConfig, or vpc-utils references in src/
• Only expected VPC references remain (negative tests + deployed-state CDK tracking)

[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	44.12%	2996 / 6790
🔵	Statements	43.68%	3153 / 7217
🔵	Functions	45.92%	620 / 1350
🔵	Branches	48.49%	1935 / 3990

Generated in workflow #775 for commit f2526ef by the Vitest Coverage Report Action