Self-hosted Docker stack (embedded Supabase + storage + email) and local Ollama models

From the PR description

Summary

A single docker compose up brings up the entire app with no external accounts - a more automated alternative to the CLI-based approach in #44, plus local LLM support.

Self-contained stack

• Embedded Supabase in compose: Postgres + GoTrue auth + PostgREST + an nginx gateway. Schema auto-loads on first boot; no supabase CLI needed.
• RustFS for S3-compatible object storage, replacing Cloudflare R2 (the backend already uses path-style S3, so it's drop-in).
• Mailpit catches auth emails (signup/confirmation) in a local inbox at :8025.
• Production-style image builds (not bind-mount + npm install on start).

Local models via Ollama

• New provider speaking Ollama's OpenAI-compatible chat API, with the agentic tool-call loop and a graceful fallback for models that don't support tools.
• Models detected dynamically (GET /models/ollama) and shown in every picker (chat, title, tabular) under a Local group - no API key. Any ollama/<tag> id is valid by prefix.
• A Refresh button on the API Keys page re-detects installed models and re-checks key status, live to the pickers.

How this differs from #44

• One command, all-in-one - no supabase start, no fork of the Supabase CLI stack.
• Embedded Supabase + RustFS + Mailpit vs. relying on the CLI's Supabase + Storage.
• Adds local LLM (Ollama) support, which #44 doesn't have.

Test plan

• docker compose up --build brings up all services; schema auto-applies (23 public tables)
• End-to-end signup → Mailpit confirmation email → confirm → login
• Chat streams from ollama/qwen3.6; phi3:mini falls back to no-tools
• GET /models/ollama returns installed models (401 unauthenticated)
• Ollama models selectable as chat + tabular review models

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