feat(installer): J6412 USB installer + AR Electronics license activation server

installer/:
  - build_usb.py: dev tool — builds Flutter + AR-ECDIS, assembles USB pendrive
    image with serial.key, autorun.inf, and START_INSTALLER.bat
  - serial_generator.py: generates AR-XXXX-XXXX-XXXX serial numbers (48-bit
    entropy), logs to CSV for CRM integration
  - src/license.py: hardware fingerprint (Windows MachineGuid + primary MAC),
    serial validation, online activation POST, local cache with 30-day offline
    grace period
  - src/sysconfig.py: HKCU autostart registry entries, .lnk shortcuts (desktop
    + Start Menu via WScript.Shell), firewall rules (netsh), COM port detection
  - src/install.py: tkinter installer GUI — 9 sequential steps with per-step
    progress indicators, threaded execution, error dialogs, and silent mode

license_server/ (FastAPI service — deploy to arelectronics.com VPS):
  - POST /api/v1/activate: first activation accepted; same-HW re-activation
    refreshes heartbeat; different-HW rejected with 409
  - GET  /api/v1/validate/{serial}: heartbeat endpoint to refresh offline cache
  - Admin endpoints (X-Admin-Key): issue, list, revoke licenses
  - SQLAlchemy models: License (serial registry) + Activation (per-machine rows)
  - SQLite default, PostgreSQL-ready via DATABASE_URL env var

AR_electronics — AR-Autopilot Project

license_server/schemas.py

@@ -0,0 +1,69 @@
+# =============================================================================
+#  license_server/schemas.py — Pydantic v2 request/response schemas
+# =============================================================================
+
+from datetime import datetime
+from typing import Optional
+
+from pydantic import BaseModel, Field
+
+
+# ---------------------------------------------------------------------------
+#  Activation
+# ---------------------------------------------------------------------------
+
+class ActivationRequest(BaseModel):
+    serial:       str = Field(..., pattern=r"^AR-[0-9A-Fa-f]{4}-[0-9A-Fa-f]{4}-[0-9A-Fa-f]{4}$")
+    hardware_id:  str = Field(..., min_length=16, max_length=64)
+    app_version:  str = Field(default="", max_length=20)
+    platform:     str = Field(default="", max_length=20)
+    hostname:     str = Field(default="", max_length=120)
+
+
+class ActivationResponse(BaseModel):
+    activation_id: str
+    vessel_slot:   int
+    licensed_to:   str
+    activated_at:  datetime
+    expires_at:    Optional[datetime] = None
+
+
+# ---------------------------------------------------------------------------
+#  Validation
+# ---------------------------------------------------------------------------
+
+class ValidateResponse(BaseModel):
+    serial:        str
+    active:        bool
+    hardware_id:   str
+    activation_id: str
+    vessel_slot:   int
+    licensed_to:   str
+    activated_at:  datetime
+    last_seen_at:  datetime
+
+
+# ---------------------------------------------------------------------------
+#  Admin list
+# ---------------------------------------------------------------------------
+
+class LicenseAdminRecord(BaseModel):
+    serial:       str
+    vessel:       str
+    issued_at:    datetime
+    is_active:    bool
+    activations:  int
+
+
+class ActivationAdminRecord(BaseModel):
+    activation_id: str
+    serial:        str
+    hardware_id:   str
+    app_version:   str
+    platform:      str
+    hostname:      str
+    activated_at:  datetime
+    last_seen_at:  datetime
+    vessel_slot:   int
+    revoked:       bool
+    licensed_to:   str