Git workflow, environments & CI/CD pipeline (#1)

CHANGELOG.md

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+# Changelog
+
+All notable changes to InboxIntel are documented here. Format follows
+[Keep a Changelog](https://keepachangelog.com/); versions follow
+[Semantic Versioning](https://semver.org/). See [docs/WORKFLOW.md](docs/WORKFLOW.md).
+
+## [Unreleased]
+### Security
+- Patched all High/Moderate NuGet advisories the new dependency gate surfaced:
+  `System.Text.Json` 8.0.0→8.0.6, `Microsoft.Extensions.Caching.Memory` 8.0.0→8.0.1
+  (+ `DependencyInjection.Abstractions`→8.0.2), `System.Security.Cryptography.Xml`
+  8.0.1→8.0.3 (transitive pins), and `MailKit`/`MimeKit` 4.13.0→4.17.0.
+
+### Added
+- CI/CD pipeline (`.gitea/workflows/`): `security` (gitleaks secret scan + NuGet/npm
+  vulnerability gate), `deploy-staging` (auto-redeploy local staging on `develop`),
+  `deploy-prod` (tag-gated production promotion, inactive until the server exists).
+- Formal Git workflow & environment strategy (`docs/WORKFLOW.md`).
+- Staging environment overlay (`docker-compose.staging.yml`) — production-shaped
+  Linux containers on Windows, isolated ports/volumes.
+- Version-controlled Git hooks (`scripts/git-hooks/`) + installer
+  (`scripts/install-hooks.ps1`): pre-commit secret/format checks, pre-push
+  build+test gate.
+- `VERSION` file as the single source of truth for the release number.
+
+## [0.1.0] — scaffold
+### Added
+- .NET 8 Clean Architecture backend (Domain/Application/Infrastructure/Api) + React/Vite SPA.
+- Docker Compose stack (Postgres 16, API, frontend, optional nginx proxy).
+- Gitea Actions CI (backend build+test, frontend build) on `main`/`develop` + PRs.
+- Security hardening: encrypted OAuth tokens, EF global query filters (IDOR),
+  loopback binds, non-root containers, SSRF egress guard.
+- One-command deploy scripts (`deploy/up.ps1`, `deploy/up.sh`).
+
+[Unreleased]: https://your-gitea-host/InboxIntel/compare/v0.1.0...HEAD