Fix nil pointer dereference when using unsupported task types with cache

[Copilot]

Nil pointer panic occurred when switching from -type aqc,miit to -type all with cached data. Types like xlb and qcc are defined in ENSTypes but not implemented in the jobs map, leaving enJob.job nil while execution continued.

Changes

runner/runner.go

• Early return in processTask when task type not found in jobs/apps map
• Properly decrements WaitGroup and sends empty result to prevent deadlock

runner/enscan.go

• Nil check in SearchByKeyWord before calling j.job.AdvanceFilter()
• Nil check at start of processTask before accessing j.job.GetEnsD() and j.job.GetENMap()

Users no longer need to manually delete enscan.gob cache when switching query modes.

Original prompt

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This section details on the original issue you should resolve

<issue_title>type切换查询模式的时候，会出现runtime error内存地址报错</issue_title>
<issue_description>enscan.exe -n 小米 -type aqc,miit
查询后，继续使用-type all查询，会爆出如下错误

必须删除目录下的enscan.gob缓存文件才能继续进行查询

[ERR] 未找到 xlb 任务模式panic: runtime error: invalid memory address or nil pointer dereference[signaL 0xc0000005 code=0x0 addr=0x18 pc=0x8009dc]
goroutine 82 [running]:github.com/wgpsec/ENScan/runner.(EnJob).SearchBykeyWord(Oxc0003ac360, {0xc000032168, Ox18})/home/runner/work/ENScan_G0/ENScan_G0/runner/enscan.go:15 +0x3cgithub.com/wgpsec/ENScan/runner.CE5Job).processTask(Oxc00019b1e0, ff0xc000032168, Ox18},{0x9cb5d1, Ox33, {0x0,0x0}})/home/runner/work/ENScan_G0/ENScan_G0/runner/runner.go:180 +0x587github.com/wgpsec/ENScan/runner.(*ESJob).StartENworkers.func1()/home/runner/work/ENScan_G0/ENScan_G0/runner/runner.go:302 +0xcccreated by github.com/wgpsec/ENScan/runner.(*ESJob).StartENworkers in goroutine 1/home/runner/work/ENScan_G0/ENScan_G0/runner/runner.go:300 +0x66

go版本信息：
go version go1.25.5 windows/amd64</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes type切换查询模式的时候，会出现runtime error内存地址报错 #213

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