initial commit: Artifacto v0.1

Self-hosted HTML artifact publisher. Single Go binary, SQLite metadata,
HTML on disk. Features: password-protected artifacts, per-artifact expiration,
admin dashboard with view metrics (privacy-preserving daily-salt visitor hash,
sparklines, 30-day SVG chart, top referrers), rate-limited unlock endpoint.

Packaged as a Docker image (two-stage, CGO_ENABLED=0, pure-Go SQLite).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

internal/store/migrations/001_init.sql

@@ -0,0 +1,50 @@
+CREATE TABLE IF NOT EXISTS artifacts (
+    slug           TEXT PRIMARY KEY,
+    title          TEXT NOT NULL DEFAULT '',
+    size_bytes     INTEGER NOT NULL,
+    password_hash  TEXT,
+    created_at     INTEGER NOT NULL,
+    expires_at     INTEGER,
+    view_count     INTEGER NOT NULL DEFAULT 0,
+    last_viewed_at INTEGER
+);
+
+CREATE INDEX IF NOT EXISTS idx_artifacts_created_at ON artifacts(created_at DESC);
+
+CREATE TABLE IF NOT EXISTS views (
+    id         INTEGER PRIMARY KEY AUTOINCREMENT,
+    slug       TEXT NOT NULL,
+    viewed_at  INTEGER NOT NULL,
+    visitor    TEXT NOT NULL,
+    referrer   TEXT,
+    FOREIGN KEY (slug) REFERENCES artifacts(slug) ON DELETE CASCADE
+);
+
+CREATE INDEX IF NOT EXISTS idx_views_slug_time ON views(slug, viewed_at);
+CREATE INDEX IF NOT EXISTS idx_views_time ON views(viewed_at);
+
+CREATE TABLE IF NOT EXISTS daily_stats (
+    slug     TEXT NOT NULL,
+    day      TEXT NOT NULL,
+    views    INTEGER NOT NULL DEFAULT 0,
+    uniques  INTEGER NOT NULL DEFAULT 0,
+    PRIMARY KEY (slug, day),
+    FOREIGN KEY (slug) REFERENCES artifacts(slug) ON DELETE CASCADE
+);
+
+CREATE INDEX IF NOT EXISTS idx_daily_stats_day ON daily_stats(day);
+
+CREATE TABLE IF NOT EXISTS unlock_attempts (
+    id        INTEGER PRIMARY KEY AUTOINCREMENT,
+    slug      TEXT NOT NULL,
+    at        INTEGER NOT NULL,
+    visitor   TEXT NOT NULL,
+    success   INTEGER NOT NULL
+);
+
+CREATE INDEX IF NOT EXISTS idx_unlock_attempts_slug_time ON unlock_attempts(slug, at);
+
+CREATE TABLE IF NOT EXISTS meta (
+    key TEXT PRIMARY KEY,
+    value TEXT NOT NULL
+);