feat(08-01): add custom_dorks table and CRUD for user-authored dorks

- schema.sql: CREATE TABLE IF NOT EXISTS custom_dorks with unique dork_id,
  source/category indexes, and tags stored as JSON TEXT
- custom_dorks.go: Save/List/Get/GetByDorkID/Delete with JSON tag round-trip
- Tests: round-trip, newest-first ordering, not-found, unique constraint,
  delete no-op, schema migration idempotency

pkg/storage/schema.sql

@@ -37,3 +37,21 @@ CREATE TABLE IF NOT EXISTS settings (
 CREATE INDEX IF NOT EXISTS idx_findings_scan_id ON findings(scan_id);
 CREATE INDEX IF NOT EXISTS idx_findings_provider ON findings(provider_name);
 CREATE INDEX IF NOT EXISTS idx_findings_created ON findings(created_at DESC);
+
+-- Phase 8: user-authored dork definitions complementing the embedded
+-- YAML-based dork registry (pkg/dorks/definitions). Embedded dorks are
+-- read-only; custom_dorks stores rows created via `keyhunter dorks add`.
+CREATE TABLE IF NOT EXISTS custom_dorks (
+    id          INTEGER PRIMARY KEY AUTOINCREMENT,
+    dork_id     TEXT NOT NULL UNIQUE,
+    name        TEXT NOT NULL,
+    source      TEXT NOT NULL,
+    category    TEXT NOT NULL,
+    query       TEXT NOT NULL,
+    description TEXT,
+    tags        TEXT,  -- JSON array
+    created_at  DATETIME DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE INDEX IF NOT EXISTS idx_custom_dorks_source ON custom_dorks(source);
+CREATE INDEX IF NOT EXISTS idx_custom_dorks_category ON custom_dorks(category);