chore: initial project setup with documentation

- Add PHILOSOPHY.md with UI vision and principles
- Add README.md with project overview and operational details
- Add AGENTS.md with LLM agent instructions
- Add PLAN.md with implementation roadmap
- Add .gitignore for Flutter project

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

AGENTS.md

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+# LLM Agent Instructions
+
+This document contains instructions and documentation references for AI assistants working with this codebase.
+
+> **📖 Important**: Before working on this project, read [PHILOSOPHY.md](PHILOSOPHY.md) to understand the system vision, architectural patterns, and design goals. All development should work towards realizing those patterns.
+# AGENTS.md
+
+> **Start every session by reading this file.**
+> This file outlines the operational protocols, coding standards, and architectural decisions for this FastAPI project.
+
+## 1. Agent Operational Protocols
+
+### 🧠 Work Patterns (Plan-Act-Reflect)
+* **Plan:** Before writing code, briefly outline your plan. Identify which files you will touch and what the side effects might be.
+* **Act:** Execute the changes in small, atomic steps.
+* **Reflect:** After coding, verify your work. Did you break existing tests? Did you add new tests?
+
+### 🌐 Internal Service Access
+* **git.schweitz.net**: Access via `http://localhost:3002` (direct Gitea) to bypass Authentik SSO
+  * Example: `curl http://localhost:3002/jpmschweitzer/library-desk/raw/branch/main/README.md`
+  * Public repos are readable without authentication
+  * Related repos: , `core-api`, `tatlock`, `library-desk`, `scheduler`, `portainer-core`
+
+### 🐳 Deployment & Infrastructure
+* **Full stack documentation**: Available in the `portainer-core` repo
+  * Access: `curl http://localhost:3002/jpmschweitzer/portainer-core/raw/branch/main/CONTAINERS.md`
+  * Contains: All service ports, URLs, Redis DB allocations, external domains
+* **Tatlock deployment**:
+  * LAN: `http://192.168.86.149:8000`
+  * External: `tatlock.schweitz.net` (behind Authentik SSO)
+  * Redis DBs: 1 (memory), 6 (benchmarks)
+* **Health check**: `curl http://192.168.86.149:8000/health`
+
+### 🛡️ Git Discipline
+* **NEVER commit to `main` or `master` directly.** Always create a feature branch: `feature/your-feature-name` or `fix/issue-description`.
+* **Commit Messages:** Use the [Conventional Commits](https://www.conventionalcommits.org/) format.
+    * `feat: add user login endpoint`
+    * `fix: resolve database connection timeout`
+    * `refactor: split monolith dependency file`
+* **Atomic Commits:** Keep commits small. One logical change = one commit.
+
+### 📝 Changelog Maintenance
+* **Update `CHANGELOG.md`** with every user-facing change.
+* Format: `## [Unreleased] - YYYY-MM-DD` followed by `### Added`, `### Changed`, or `### Fixed`.