chore: bootstrap rust backend workspace and migration master plan

Cargo.toml

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+[workspace]
+resolver = "2"
+members = [
+  "apps/gateway",
+  "apps/users",
+  "apps/companies",
+  "apps/customers",
+  "apps/professionals",
+  "apps/jobseekers",
+  "crates/contracts",
+  "crates/config",
+  "crates/errors",
+  "crates/db",
+  "crates/observability",
+  "crates/auth",
+]
+
+[workspace.package]
+edition = "2021"
+license = "Proprietary"
+authors = ["NXTGAUGE Team"]
+
+[workspace.dependencies]
+anyhow = "1"
+axum = "0.8"
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+thiserror = "2"
+tokio = { version = "1", features = ["full"] }
+tracing = "0.1"
+tracing-subscriber = { version = "0.3", features = ["env-filter", "fmt"] }
+tonic = "0.12"
+prost = "0.13"
+sqlx = { version = "0.8", features = ["runtime-tokio-rustls", "postgres", "uuid", "chrono", "json"] }
+uuid = { version = "1", features = ["serde", "v4"] }
+chrono = { version = "0.4", features = ["serde"] }

README.md

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+# NXTGAUGE Backend Rust
+
+Rust migration target for `nxtgauge-nov-2025-backend`, preserving the same microservices and request flow.
+
+## Target Service Topology
+- `gateway` (HTTP API)
+- `users` (identity, runtime roles, onboarding, approvals)
+- `companies`
+- `customers`
+- `professionals`
+- `jobseekers`
+
+## Migration Policy
+- Keep contracts stable (REST + proto semantics).
+- Keep runtime-config and onboarding schema behavior unchanged during parity phases.
+- Replace service implementations one by one.
+
+See `docs/MIGRATION_MASTER_PLAN.md` for full staged plan.

docs/MIGRATION_MASTER_PLAN.md

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+# Backend Rust Migration Master Plan
+
+## Goal
+Re-implement backend services in Rust while preserving architecture, service boundaries, data flow, and runtime behavior.
+
+## Current-to-Target Mapping
+- NestJS gateway -> Rust gateway
+- NestJS users -> Rust users
+- NestJS companies -> Rust companies
+- NestJS customers -> Rust customers
+- NestJS professionals -> Rust professionals
+- NestJS jobseekers -> Rust jobseekers
+
+## Hard Constraints
+1. Same microservice boundaries.
+2. Same role/runtime-config flow.
+3. Same onboarding state transitions and schema lookup behavior.
+4. Same auth/session behavior at gateway boundary.
+5. No contract-breaking change unless explicitly versioned.
+
+## Stage Sequence
+1. Freeze contracts and DB assumptions.
+2. Implement Rust shared crates (`config`, `errors`, `db`, `auth`, `observability`, `contracts`).
+3. Implement Rust gateway with parity adapters to existing services.
+4. Migrate `users` service to Rust and switch gateway client to Rust users.
+5. Migrate `companies` service to Rust.
+6. Migrate `customers` service to Rust.
+7. Migrate `professionals` service to Rust.
+8. Migrate `jobseekers` service to Rust.
+9. Remove legacy Nest services after full parity signoff.
+
+## Phase Exit Checklist (Apply Every Stage)
+- Build passes.
+- Contract tests pass.
+- Runtime-config and onboarding smoke tests pass.
+- No P0/P1 behavior regressions.
+- Rollback path validated.