docs: add user flow diagrams, sample SQL test data, and test plan

[rahuliitk]

Summary

• userflow.md: 16 ASCII user flow diagrams covering onboarding, compliance lifecycle, control/policy/risk state machines, audit workflow, evidence collection, incident management, monitoring, and multi-tenant RBAC
• samplesql.sql: Sample data across 33 tables (3 orgs, 10 users, 6 frameworks, 15 controls, 7 policies, 7 risks, 4 incidents, 6 vendors, and more) with 12 ready-to-use test queries
• test.md: Comprehensive test plan with 30 sections and 300+ test cases covering all features, API endpoints, AI agents, integrations, frontend UI, and infrastructure

Test plan

• Files created and committed
• Content verified against actual database models and API routes

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