Phase 3.5: Automation & Agents Plugin

Neues automation Plugin (app/plugins/builtins/automation/):
- 7 DB-Modelle: AgentDefinition, AgentVersion, AutomationDefinition,
  AutomationVersion, AutomationCronJob, AgentRun, AutomationRun
- Migration 0001_initial.sql mit allen Tabellen + RLS
- PluginManifest erweitert: agent_definitions, automation_templates,
  cron_jobs, heartbeat_configs, miniapps Contribution-Felder
- 21 API-Endpoints: /api/v1/automation (CRUD, execute, dry-run,
  runs, versions, restore, settings, miniapps) + /api/v1/agents
  (CRUD, execute, test-run, runs, versions, restore, tools, send-message)

Backend Features:
- Cron-Scheduler (scheduler.py): ARQ-basiert, liest CronJob-Tabelle,
  enqueued run_agent/run_automation, croniter fuer next_run_at
- Workflow-Timeout-Worker (workflow_timeout.py): prueft abgelaufene
  WorkflowInstances, setzt cancelled, sendet Notification
- Agent Runner (agent_runner.py): LiteLLM + ToolRegistry, proactive/
  reactive mode, Rate-Limiting, Budget-Limit, Infinite-Loop-Detection
- Automation Execution Engine (execution_engine.py): Condition
  evaluation (eq/ne/gt/lt/contains/exists), Actions (api_call/
  notification/workflow_start), Dry-Run mode
- Agent-to-Agent Communication (agent_comm.py): send_agent_message
  tool, kommunikation plugin integration
- Plugin-Beitraege: register/unregister on activate/deactivate,
  Konfliktloesung mit Plugin-Name als Prefix
- Heartbeat-Migration: ai_proactive heartbeat als Cron-Job
- Versionshistorie: Auto-Versioning bei Updates, Restore-Endpoint
- Settings: GET/PATCH /api/v1/automation/settings
- ARQ Worker: 11 functions, 2 cron_jobs (scheduler_tick 30s,
  check_workflow_timeouts 5min)

Frontend:
- AutomationDashboard.tsx: Automation Builder UI mit Trigger,
  Conditions, Actions, Execute, Dry-Run, Run-History, Versions
- AgentDashboard.tsx: Agent Builder UI mit Model, Tools, Prompt,
  Heartbeat, Rate-Limits, Execute, Test-Run, Agent-Chat
- AutomationSettings.tsx: Settings + MiniApp-Builder
- automation.ts: 24 React Query Hooks
- automation.ts types: TypeScript Interfaces
- routes/index.tsx: /automation, /agents, /settings/automation

Tests:
- 22 Frontend-Tests (AutomationDashboard, AgentDashboard, API) — alle bestanden
- Backend-Tests: test_automation.py (CRUD, versions, conditions, dry-run, rate-limiting)
- TSC: keine neuen Errors (nur pre-existing Dms.tsx)
- croniter dependency installiert

app/plugins/manifest.py

@@ -2,6 +2,8 @@
 
 from __future__ import annotations
 
+from typing import Any
+
 from pydantic import BaseModel, Field, field_validator
 
 
@@ -78,6 +80,50 @@ class FrontendSettingsPage(BaseModel):
     permission: str = Field(default="", description="Optional permission required")
 
 
+class AgentDefinitionContribution(BaseModel):
+    """An agent definition contributed by a plugin manifest."""
+
+    name: str = Field(..., min_length=1, max_length=120)
+    description: str = Field(default="", max_length=500)
+    llm_model: str = Field(default="ollama/deepseek-v4-flash", max_length=100)
+    system_prompt: str = Field(default="")
+    tool_ids: list[str] = Field(default_factory=list)
+    heartbeat_interval_seconds: int = Field(default=0, ge=0)
+    mode: str = Field(default="reactive", pattern="^(proactive|reactive)$")
+    max_executions_per_hour: int = Field(default=10, ge=1, le=1000)
+    max_duration_seconds: int = Field(default=300, ge=1, le=86400)
+    budget_limit_usd: float = Field(default=1.0, ge=0.0, le=10000.0)
+
+
+class AutomationTemplateContribution(BaseModel):
+    """An automation template contributed by a plugin manifest."""
+
+    name: str = Field(..., min_length=1, max_length=120)
+    description: str = Field(default="", max_length=500)
+    trigger_type: str = Field(default="event", pattern="^(event|schedule|manual)$")
+    trigger_config: dict = Field(default_factory=dict)
+    conditions: list[dict] = Field(default_factory=list)
+    actions: list[dict] = Field(default_factory=list)
+
+
+class CronJobContribution(BaseModel):
+    """A cron job contributed by a plugin manifest."""
+
+    name: str = Field(..., min_length=1, max_length=120)
+    cron_expression: str = Field(..., min_length=1, max_length=100)
+    job_type: str = Field(..., pattern="^(agent_heartbeat|automation_trigger|custom)$")
+    target_name: str = Field(default="", description="Reference agent/automation by name")
+    plugin_name: str = Field(default="")
+
+
+class HeartbeatConfigContribution(BaseModel):
+    """A heartbeat config contributed by a plugin manifest."""
+
+    agent_name: str = Field(..., min_length=1, max_length=120)
+    interval_seconds: int = Field(..., ge=1)
+    target_room: str = Field(default="")
+
+
 class FrontendDashboardWidget(BaseModel):
     """A dashboard widget contributed by a plugin."""
 
@@ -92,6 +138,16 @@ class FrontendDashboardWidget(BaseModel):
     permission: str = Field(default="", description="Optional permission required")
 
 
+class MiniAppContribution(BaseModel):
+    """A MiniApp contributed by a plugin manifest."""
+
+    app_id: str = Field(..., min_length=1, max_length=80)
+    name: str = Field(..., min_length=1, max_length=120)
+    icon: str = Field(default="AppWindow")
+    description: str = Field(default="")
+    render_schema: dict[str, Any] = Field(default_factory=dict)
+
+
 class PluginManifest(BaseModel):
     """Manifest describing a plugin's metadata, dependencies, and capabilities."""
 
@@ -142,6 +198,23 @@ class PluginManifest(BaseModel):
     dashboard_widgets: list[FrontendDashboardWidget] = Field(
         default_factory=list, description="Dashboard widgets contributed by this plugin"
     )
+    # ── Plugin Contribution fields (Phase 3.5C) ──
+    agent_definitions: list[AgentDefinitionContribution] = Field(
+        default_factory=list, description="Agent definitions contributed by this plugin"
+    )
+    automation_templates: list[AutomationTemplateContribution] = Field(
+        default_factory=list, description="Automation templates contributed by this plugin"
+    )
+    cron_jobs: list[CronJobContribution] = Field(
+        default_factory=list, description="Cron jobs contributed by this plugin"
+    )
+    heartbeat_configs: list[HeartbeatConfigContribution] = Field(
+        default_factory=list, description="Heartbeat configs contributed by this plugin"
+    )
+    miniapps: list[MiniAppContribution] = Field(
+        default_factory=list, description="MiniApps contributed by this plugin"
+    )
+
 
     @field_validator("name")
     @classmethod
@@ -153,6 +226,9 @@ class PluginManifest(BaseModel):
     model_config = {"extra": "forbid"}
 
 
+PluginManifest.model_rebuild()
+
+
 class ManifestSchemaResponse(BaseModel):
     """Response model describing the manifest schema for API consumers."""
 
@@ -258,3 +334,6 @@ MANIFEST_SCHEMA_DOC = ManifestSchemaResponse(
         ],
     ),
 )
+
+
+PluginManifest.model_rebuild()