Next.js Static Architecture Implementation: Vanguard Tax Core & Alpha Logistics Core

OVERVIEW & ARCHITECTURAL BLUEPRINTWe are deploying two specific client-side simulation terminal modules under our unified SaaS fleet portal (://qtreasurycore.com). This project requires the implementation of the user interfaces, localized calculation engines, and client-side storage structures for SaaS Module 2 (/vanguard-tax-core) and SaaS Module 3 (/alpha-logistics-core).Both modules must be engineered to adhere strictly to our zero-overhead, hyper-secure technical constraints.RIGID TECHNICAL CONSTRAINTSPure Static Compilation: Every component must compile down to pure client-side code utilizing Next.js static exports (output: 'export'). Dynamic Node.js server runtimes, middleware loops, or backend API routes are strictly prohibited.Zero-Knowledge Viewport Sandbox: To preserve total data privacy, no user transaction telemetry, financial inputs, or calculation results may ever be transmitted to external servers. All session parameters and user data profiles must reside and persist entirely client-side inside the user's browser via IndexedDB.Access Routing & Gate: Both modules must integrate seamlessly with our established client-side Payhip + Web Crypto API JWT validation script (src/utils/crypto.ts). The application view must remain locked until a valid, unexpired token signature is cryptographically verified in the local browser viewport context.AWS Infrastructure Footprint: All compiled assets will be deployed as standard flat directory structures to Amazon S3 behind Amazon CloudFront, operating safely within our hard ceiling of $10.00/month maximum AWS overhead.DETAILED MODULE SPECIFICATIONS1. SaaS Module 2: Vanguard Tax Core (/vanguard-tax-core)Objective: Build a responsive, highly analytical financial simulation dashboard enabling users to model complex cross-border corporate tax scenarios and asset distribution structures.Core Algorithmic Rule: The client-side calculation engine must enforce a hardcoded 15.00% tax cushion safety constant across all simulated net margins. No calculations are allowed to bypass this buffer parameter.2. SaaS Module 3: Alpha Logistics Core (/alpha-logistics-core)Objective: Build an operational supply-chain routing and vessel payload simulator visualizing trade route efficiencies, fuel burn, and variable voyage overhead.Core Algorithmic Rule: The computation engine must integrate the updated 2026 EU ETS (Emissions Trading System) compliance multipliers directly into the local voyage costing loops.FIXED-PRICE MILESTONE DISBURSEMENT SCHEDULEMilestone 1: Vanguard Tax Core Implementation — $2,000.00Deliverables: Fully operational, statically compiled Next.js route at /vanguard-tax-core. Flawless IndexedDB state initialization applying the 15.00% cushion formula, clean integration with the Payhip JWT gate component, and verified, error-free deployment sync to our staging S3 bucket.Milestone 2: Alpha Logistics Core Implementation — $2,000.00Deliverables: Fully operational, statically compiled Next.js route at /alpha-logistics-core. Implementation of logistics data views incorporating the 2026 EU ETS compliance multipliers, full local persistence layout, and final verified production asset deployment sign-off.