feat(pos): add inventory blueprint — CRUD, operations, physical count, reports, alerts

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

pos/migrations/v1.0_initial.sql

@@ -352,5 +352,28 @@ CREATE INDEX idx_audit_log_created ON audit_log(created_at);
 CREATE UNIQUE INDEX idx_inventory_branch_part ON inventory(branch_id, part_number);
 CREATE INDEX idx_employee_sessions_token ON employee_sessions(token);
 
+-- =====================
+-- PHYSICAL COUNTS (two-phase inventory count)
+-- =====================
+CREATE TABLE IF NOT EXISTS physical_counts (
+    id SERIAL PRIMARY KEY,
+    branch_id INTEGER NOT NULL REFERENCES branches(id),
+    status VARCHAR(20) NOT NULL DEFAULT 'draft',  -- draft, approved, cancelled
+    notes TEXT,
+    employee_id INTEGER REFERENCES employees(id),
+    approved_by INTEGER REFERENCES employees(id),
+    created_at TIMESTAMP DEFAULT NOW(),
+    approved_at TIMESTAMP
+);
+
+CREATE TABLE IF NOT EXISTS physical_count_lines (
+    id SERIAL PRIMARY KEY,
+    physical_count_id INTEGER NOT NULL REFERENCES physical_counts(id),
+    inventory_id INTEGER NOT NULL REFERENCES inventory(id),
+    expected_quantity INTEGER NOT NULL,
+    counted_quantity INTEGER NOT NULL,
+    difference INTEGER NOT NULL
+);
+
 -- Barcode sequence
 CREATE SEQUENCE IF NOT EXISTS barcode_seq START 1;