docs: add README and env examples

.env.example

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+POSTGRES_USER=postgres
+POSTGRES_PASSWORD=your-password-here
+POSTGRES_DB=loft
+DATABASE_URL=postgres://postgres:your-password-here@db:5432/loft
+STORAGE_PATH=/app/storage

README.md

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+# loft
+
+A minimal, self-hosted web app (with a cloud storage option planned), built as a learning exercise to get more familiar with Axum and Svelte.
+
+## What it does
+- Register / log in (session-based auth)
+- Upload, list, download, and delete files
+- Browse files in a grid/tile view with image preview and prev/next navigation
+- Stream file content via HTTP range requests — the groundwork for video streaming
+
+## Requirements
+- **To run:** Docker + Docker Compose — that's all (Rust/Node build inside the image).
+- **To develop:** Rust (cargo + `sqlx-cli`), Node + pnpm, `just`, and Docker (for Postgres).
+
+## Quick start
+```bash
+git clone https://git.stefiosif.dev/stefiosif/loft
+cd loft
+cp .env.example .env
+
+# Run in Docker (http://localhost:3000):
+docker compose up -d
+
+# Run locally (http://localhost:5173):
+cp backend/.env.example backend/.env
+just db-setup
+# inside tmux together frontend and backend
+just watch
+# or separately
+just watch-backend
+just watch-frontend
+
+# API docs (Swagger UI, generated with utoipa): http://localhost:3000/swagger-ui
+
+# Run tests:
+cp backend/.env.test.example backend/.env.test
+just watch-test
+```
+
+## Commands
+Run `just --list` to see all recipes.

backend/.env.example

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+DATABASE_URL=postgres://postgres:your-password-here@localhost:5432/loft
+STORAGE_PATH=/tmp/loft-files
+POSTGRES_USER=postgres
+POSTGRES_PASSWORD=your-password-here
+POSTGRES_DB=loft

backend/.env.test.example

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+DATABASE_URL=postgres://postgres:your-password-here@localhost:5432/loft_test
+STORAGE_PATH=/tmp/loft-files-test
+ENVIRONMENT=test