Eingehende Ausloeser: n8n und andere starten Agenten (#725, Stufe 1)

Something outside hands an agent a task - an n8n workflow on a mail, a
schedule, a form, or any system that sends an HTTP request.

- Core/Triggers/InboundTriggers: one token per trigger and agent, kept as a
  hash and shown once; a rate per hour; deliveries up to 64 KB. Each
  delivery becomes a task whose content is framed as foreign content with its
  origin; every delivery, accepted or refused, is in the audit (source
  "trigger").
- POST /hooks/trigger on the instance (MCP socket, own token, no browsers);
  the manager forwards /hooks/{instance}/trigger. /api/triggers to issue,
  list and revoke.
- Agent view: a triggers card with the address and an n8n/curl example.
- Nothing writes back: no right to create or change workflows.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/ClawdDotNet.Core/Storage/SqliteStorage.cs

@@ -373,6 +373,28 @@ public sealed class SqliteStorage
                 PRIMARY KEY (VoteId, Voter)
             );
 
+            -- #725: inbound triggers (token kept as hash) and every delivery, accepted or not.
+            CREATE TABLE IF NOT EXISTS InboundTriggers (
+                Id        TEXT    PRIMARY KEY,
+                Label     TEXT    NOT NULL,
+                AgentId   TEXT    NOT NULL,
+                TokenHash TEXT    NOT NULL UNIQUE,
+                PerHour   INTEGER NOT NULL,
+                CreatedAt TEXT    NOT NULL,
+                RevokedAt TEXT    NULL
+            );
+
+            CREATE TABLE IF NOT EXISTS InboundTriggerEvents (
+                Id         INTEGER PRIMARY KEY AUTOINCREMENT,
+                TriggerId  TEXT    NOT NULL,
+                ReceivedAt TEXT    NOT NULL,
+                Outcome    TEXT    NOT NULL,
+                Bytes      INTEGER NOT NULL,
+                TaskId     TEXT    NULL
+            );
+
+            CREATE INDEX IF NOT EXISTS IX_InboundTriggerEvents_Trigger ON InboundTriggerEvents (TriggerId, ReceivedAt);
+
             CREATE TABLE IF NOT EXISTS StagedCalls (
                 Id              INTEGER PRIMARY KEY AUTOINCREMENT,
                 RunId           TEXT    NOT NULL,