feat(drivers): implement in-process cron scheduler driver plugin

backend/plugins/drivers/driver_inproc_cron/plugin.go

@@ -0,0 +1,81 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+// Package driver_inproc_cron provides the zero-dependency in-process cron scheduler driver plugin for Cordis.
+package driver_inproc_cron
+
+import (
+	"context"
+	"sync"
+
+	"Wavelet/core"
+)
+
+// Plugin implements core.Plugin and core.Driver for in-process cron job scheduling.
+type Plugin struct {
+	mu        sync.RWMutex
+	coreCtx   *core.Context
+	scheduler *inprocScheduler
+}
+
+// New creates a new in-process cron scheduler driver plugin.
+func New() *Plugin {
+	return &Plugin{}
+}
+
+// Name returns the unique identifier of the plugin.
+func (p *Plugin) Name() string {
+	return "driver_inproc_cron"
+}
+
+// Manifest returns the plugin metadata.
+func (p *Plugin) Manifest() core.Manifest {
+	return core.Manifest{
+		Name:        "driver_inproc_cron",
+		Version:     "1.0.0",
+		Description: "Zero-dependency in-process cron scheduler driver plugin",
+		Author:      "Wavelet Team",
+	}
+}
+
+// Apply registers the scheduler driver into the Context.
+func (p *Plugin) Apply(ctx *core.Context) error {
+	p.mu.Lock()
+	p.coreCtx = ctx
+	p.mu.Unlock()
+
+	ctx.OnDispose(func() error {
+		return p.Stop(context.Background())
+	})
+
+	return ctx.RegisterDriver(p)
+}
+
+// Type returns DriverTypeScheduler.
+func (p *Plugin) Type() core.DriverType {
+	return core.DriverTypeScheduler
+}
+
+// Start boots the in-process cron scheduler.
+func (p *Plugin) Start(_ context.Context) error {
+	p.mu.Lock()
+	defer p.mu.Unlock()
+
+	if p.scheduler == nil {
+		p.scheduler = newInprocScheduler(p.coreCtx.Schedules(), p.coreCtx.Tasks())
+	}
+
+	return p.scheduler.Start()
+}
+
+// Stop terminates the in-process cron scheduler.
+func (p *Plugin) Stop(_ context.Context) error {
+	p.mu.Lock()
+	defer p.mu.Unlock()
+
+	if p.scheduler != nil {
+		p.scheduler.Stop()
+		p.scheduler = nil
+	}
+	return nil
+}