feat: generic webhook provider with JSONPath payload extraction

Add a new "webhook" provider type that accepts arbitrary HTTP POST payloads,
extracts template variables via user-defined JSONPath mappings, and dispatches
notifications through the existing pipeline. Supports three auth modes
(HMAC-SHA256, Bearer token, none), bounded JSONPath cache, and 1MB payload limit.

Full stack: core provider + event parser, API endpoint, DB migration,
capabilities, seeds, default templates (EN/RU), frontend descriptor, i18n.

packages/server/src/notify_bridge_server/database/migrations.py

@@ -204,6 +204,14 @@ async def migrate_schema(engine: AsyncEngine) -> None:
                     )
                     logger.info("Added %s column to tracking_config table", col_name)
 
+        # Add Generic Webhook tracking flag to tracking_config if missing
+        if await _has_table(conn, "tracking_config"):
+            if not await _has_column(conn, "tracking_config", "track_webhook_received"):
+                await conn.execute(
+                    text("ALTER TABLE tracking_config ADD COLUMN track_webhook_received INTEGER DEFAULT 1")
+                )
+                logger.info("Added track_webhook_received column to tracking_config table")
+
         # Drop legacy template content columns from template_config
         # (template content moved to template_slot child rows)
         if await _has_table(conn, "template_config"):

packages/server/src/notify_bridge_server/database/models.py

@@ -160,6 +160,9 @@ class TrackingConfig(SQLModel, table=True):
     track_ups_replace_battery: bool = Field(default=True)
     track_ups_overload: bool = Field(default=True)
 
+    # Generic Webhook event tracking
+    track_webhook_received: bool = Field(default=True)
+
     # Immich asset display
     track_images: bool = Field(default=True)
     track_videos: bool = Field(default=True)

packages/server/src/notify_bridge_server/database/seeds.py

@@ -153,6 +153,7 @@ async def _seed_default_templates() -> None:
         await _seed_provider_template(session, "scheduler", "Scheduler")
         await _seed_provider_template(session, "nut", "NUT")
         await _seed_provider_template(session, "google_photos", "Google Photos")
+        await _seed_provider_template(session, "webhook", "Generic Webhook")
         await session.commit()
 
 
@@ -179,6 +180,9 @@ async def _seed_default_command_templates() -> None:
         await _seed_provider_command_template(
             session, "google_photos", "Default Google Photos Commands", "Default Google Photos command templates",
         )
+        await _seed_provider_command_template(
+            session, "webhook", "Default Webhook Commands", "Default Generic Webhook command templates",
+        )
         await session.commit()
 
 
@@ -229,6 +233,11 @@ async def _seed_default_tracking_configs() -> None:
                 "name": "Default Scheduler",
                 "track_scheduled_message": True,
             },
+            {
+                "provider_type": "webhook",
+                "name": "Default Webhook",
+                "track_webhook_received": True,
+            },
             {
                 "provider_type": "nut",
                 "name": "Default NUT",
@@ -309,6 +318,14 @@ async def _seed_default_command_configs() -> None:
                 "default_count": 5,
                 "rate_limits": {"api": 15, "default": 10},
             },
+            {
+                "provider_type": "webhook",
+                "name": "Default Webhook",
+                "enabled_commands": ["help", "status"],
+                "response_mode": "text",
+                "default_count": 5,
+                "rate_limits": {"default": 10},
+            },
             {
                 "provider_type": "google_photos",
                 "name": "Default Google Photos",