Templates: keep large numeric params parseable

[DennisKlipp]

A required int template param with a large value is rejected as missing.

JSON numbers reach the config API as float64. RenderResult formats them with
%v, which switches to exponential notation above roughly a million, so
3493601102 becomes 3.493601102e+09. IsZero parses that as 0 and the
required check fails:

float64(3)           -> "3"                -> ToInt64 = 3
float64(8899)        -> "8899"             -> ToInt64 = 8899
float64(3493601102)  -> "3.493601102e+09"  -> ToInt64 = 0

Smaller values like a port or a phase count are unaffected, which is probably
why this went unnoticed. I ran into it with a ten digit device serial as a
template param.

Formats floats with strconv.FormatFloat(v, 'f', -1, 64) instead and handles
float in the Defaults switch. Two tests cover the formatting and the
end-to-end required check:

tmpl := &Template{Params: []Param{{Name: "serial", Type: TypeInt, Required: true}}}
_, _, err := tmpl.RenderResult(RenderModeUnitTest, map[string]any{
	"serial": float64(3493601102),
})
// before: missing required `serial`

[sourcery-ai]

Hey - I've reviewed your changes and they look great!

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