Add partition-aware smart backup and restore

Adds SmartBackupManager component that reads the partition table first,
then backs up each partition individually with chunked reads to stay
under the 300s MCP timeout. Solves timeout issues on large flash devices
(e.g. 16 MB ESP32-P4).

Tools: esp_smart_backup, esp_smart_restore
Prompt: esp_backup_plan (estimates backup time per partition)

Features:
- Adaptive chunk sizing based on measured throughput
- Skip-empty detection (0xFF regions)
- Optional gzip compression per partition
- SHA256 manifest for integrity verification
- Dry-run mode for time estimation
- Progress reporting via MCP context

src/mcesptool/components/__init__.py

@@ -15,6 +15,7 @@ from .product_catalog import ProductCatalog
 from .production_tools import ProductionTools
 from .qemu_manager import QemuManager
 from .security_manager import SecurityManager
+from .smart_backup import SmartBackupManager
 
 # Component registry for dynamic loading
 COMPONENT_REGISTRY = {
@@ -28,6 +29,7 @@ COMPONENT_REGISTRY = {
     "diagnostics": Diagnostics,
     "qemu_manager": QemuManager,
     "product_catalog": ProductCatalog,
+    "smart_backup": SmartBackupManager,
 }
 
 __all__ = [
@@ -41,5 +43,6 @@ __all__ = [
     "Diagnostics",
     "QemuManager",
     "ProductCatalog",
+    "SmartBackupManager",
     "COMPONENT_REGISTRY",
 ]

src/mcesptool/server.py

@@ -26,6 +26,7 @@ from .components import (
     ProductionTools,
     QemuManager,
     SecurityManager,
+    SmartBackupManager,
 )
 from .config import ESPToolServerConfig, get_config, set_config
 
@@ -72,6 +73,7 @@ class ESPToolServer:
             self.components["chip_control"] = ChipControl(self.app, self.config)
             self.components["flash_manager"] = FlashManager(self.app, self.config)
             self.components["partition_manager"] = PartitionManager(self.app, self.config)
+            self.components["smart_backup"] = SmartBackupManager(self.app, self.config)
 
             # Advanced features
             self.components["security_manager"] = SecurityManager(self.app, self.config)
@@ -179,6 +181,10 @@ class ESPToolServer:
                     "esp_performance_profile",
                     "esp_diagnostic_report",
                 ],
+                "smart_backup": [
+                    "esp_smart_backup",
+                    "esp_smart_restore",
+                ],
                 "product_catalog": [
                     "esp_product_search",
                     "esp_product_info",