feat: user module, mail service, Redis caching, wallet generation, exception filter, trust section, governance events

[yinkscss]

Summary

This PR implements 7 issues across the backend, frontend, and smart contracts:

Backend

• User Module (Build the User Module (CRUD) #132): UserModule, UserController, and UserService with CRUD endpoints (GET /users/me, GET /users/:id, PATCH /users/me, DELETE /users/me). All routes protected by JwtAuthGuard. Password hashes excluded from all responses via Prisma select. Includes UpdateUserDto with class-validator decorators.

• Email Service (Integrate Email Sending Service #133): MailModule configured with @nestjs-modules/mailer using async SMTP transport. Includes MailService.sendWelcomeEmail() and a Handlebars welcome email template.

• Redis Caching (Implement Redis Caching #134): RedisCacheModule using @nestjs/cache-manager with cache-manager-redis-yet. Globally configured with Redis URL fallback to in-memory. CacheInterceptor applied to health endpoint.

• Stellar Wallet Generation (Endpoint for Stellar Wallet Generation #137): POST /blockchain/wallets/generate endpoint with generateKeypair() method in StellarService using Keypair.random() from @stellar/stellar-sdk.

• Standardize Exception Filter (Standardize Global Exception Filter #124): Updated AllExceptionsFilter to return { success, statusCode, message, timestamp, path }. Validation arrays are joined. Stack traces suppressed from client responses.

Frontend

• Why Trust Nestera? (Build the "Why Trust Nestera?" Section #93): New WhyTrust.tsx component with 4 trust items (Transparent, Non-Custodial, Low Fees, No Penalty), teal checkmark icons, dark theme cards. Integrated into LandingPage between HowItWorks and SavingsProducts. Also fixed duplicate imports in LandingPage.tsx.

Smart Contracts

• Governance Event Logging (## Governance Event Logging #164): New governance_events module with structured event types (ProposalCreated, VoteCast, ProposalQueued, ProposalExecuted, ProposalCanceled) and emit helpers. Replaced all inline env.events().publish() calls in governance.rs with structured emitters. Indexed by topic for frontend consumption.

Supporting Changes

• Prisma ORM setup with User model (Prisma v7 config)
• AuthModule with Passport JWT strategy and JwtAuthGuard
• BlockchainController added to BlockchainModule
• Configuration and env validation updates for mail variables
• Merge conflict resolution with upstream throttler additions

Test Plan

• npx prisma migrate dev with PostgreSQL to verify schema
• GET /api/users/me returns 401 without JWT
• GET /api/users/me returns user data (no password) with valid JWT
• PATCH /api/users/me updates name/bio
• DELETE /api/users/me removes user
• Configure SMTP and verify welcome email sends
• GET /api/health caches with Redis (or in-memory fallback)
• POST /api/blockchain/wallets/generate returns publicKey and secretKey
• Error responses match standardized format with success: false
• "Why Trust Nestera?" renders with 4 items and teal icons
• cargo test passes for governance event changes
• Frontend builds without errors

Closes #132, closes #133, closes #134, closes #137, closes #124, closes #93, closes #164

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