maarcadetweet: initial commit

AT Protocol PDS + AppView + Tauri Desktop Client, 160-char post limit.

- PDS (Rust + axum + sqlx)
  - Auth: createAccount, createSession, refreshSession
  - Records: createRecord, deleteRecord (race-safe via SELECT FOR UPDATE)
  - Feed: feed.like.create, feed.repost.create
  - Sync: getRepo, getBlocks, getLatestCommit, getRecord (with MST proof), listRepos
  - Identity: resolveHandle
  - MST: spec-conformant (at-mst crate, 27 tests)
  - Repo: signed commits, TID counter (monotonic, 4096 wrap safe)

- AppView (Rust + axum + sqlx)
  - Jetstream consumer (WebSocket, exponential backoff, 38k+ events indexed)
  - REST API: timeline/home (graph-aware), profile, search, post (with thread hydration)
  - Handle-sync worker (did:plc + did:web)
  - JSONB embed storage + thread columns (migration 0003)
  - Like/repost counter cache (migration 0004)

- Tauri 2 + Svelte 5 Desktop Client
  - System tray (Show/Compose/Quit menu)
  - OS notifications (tauri-plugin-notification)
  - Auto-update (tauri-plugin-updater, placeholder endpoint)
  - Window-state (tauri-plugin-window-state)
  - 160-char compose with live counter
  - Image/Link embed rendering
  - LocalStorage-persisted like state
  - Timeline with poll (prepend new posts)
  - Custom TitleBar (transparent, no decorations)
  - Orange/IBM Plex Mono maarcade design

Tests: 231 Rust + 9 vitest = 240 passed.

docker-compose.yml

@@ -0,0 +1,76 @@
+services:
+  postgres-pds:
+    image: postgres:16-alpine
+    container_name: maarcadetweet-pds-db
+    restart: unless-stopped
+    environment:
+      POSTGRES_USER: pds
+      POSTGRES_PASSWORD: pds
+      POSTGRES_DB: pds
+    ports:
+      - "5434:5432"
+    volumes:
+      - pds_pg_data:/var/lib/postgresql/data
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U pds -d pds"]
+      interval: 5s
+      timeout: 3s
+      retries: 5
+
+  postgres-appview:
+    image: postgres:16-alpine
+    container_name: maarcadetweet-appview-db
+    restart: unless-stopped
+    environment:
+      POSTGRES_USER: appview
+      POSTGRES_PASSWORD: appview
+      POSTGRES_DB: appview
+    ports:
+      - "5435:5432"
+    volumes:
+      - appview_pg_data:/var/lib/postgresql/data
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U appview -d appview"]
+      interval: 5s
+      timeout: 3s
+      retries: 5
+
+  minio:
+    image: minio/minio:latest
+    container_name: maarcadetweet-minio
+    restart: unless-stopped
+    environment:
+      MINIO_ROOT_USER: minioadmin
+      MINIO_ROOT_PASSWORD: minioadmin
+    ports:
+      - "9100:9000"
+      - "9101:9001"
+    command: server /data --console-address ":9001"
+    volumes:
+      - minio_data:/data
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:9000/minio/health/live"]
+      interval: 10s
+      timeout: 3s
+      retries: 5
+
+  minio-init:
+    image: minio/mc:latest
+    container_name: maarcadetweet-minio-init
+    depends_on:
+      minio:
+        condition: service_healthy
+    entrypoint: >
+      /bin/sh -c "
+      mc alias set local http://minio:9000 minioadmin minioadmin;
+      mc mb -p local/maarcadetweet-pds || true;
+      mc mb -p local/maarcadetweet-appview || true;
+      mc anonymous set download local/maarcadetweet-pds || true;
+      mc anonymous set download local/maarcadetweet-appview || true;
+      exit 0;
+      "
+
+volumes:
+  pds_pg_data:
+  appview_pg_data:
+  minio_data: