fix(skd-compile): accept bare decimal and decimal(N) with sensible defaults

Emit-SingleValueType / emit_single_value_type previously required full
decimal(D,F) — anything else fell through to a fallback that produced
invalid <v8:Type>decimal</v8:Type> (no xs: prefix, no qualifiers).

New regex `^decimal(\((\d+)(,(\d+))?(,nonneg)?\))?$` accepts:
- decimal                → 10,2,Any (money default — most common 1C intent)
- decimal(N)             → N,0,Any (integer)
- decimal(N,nonneg)      → N,0,Nonnegative
- decimal(N,M)           → as before
- decimal(N,M,nonneg)    → as before

Synonyms (число, число(N), etc.) inherit the same forms via Resolve-TypeStr.

Shared Emit-ValueType is called from fields, parameters, and output
parameters — one fix covers all three paths. 3 existing snapshots
regenerated with proper xs:decimal + qualifiers, plus new
decimal-qualifier-defaults test case covering all 5 forms × synonyms.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/skills/cases/skd-compile/snapshots/empty-param-values/Template.xml

@@ -70,7 +70,12 @@
 	<parameter>
 		<name>ПараметрЧисло</name>
 		<valueType>
-			<v8:Type>decimal</v8:Type>
+			<v8:Type>xs:decimal</v8:Type>
+			<v8:NumberQualifiers>
+				<v8:Digits>10</v8:Digits>
+				<v8:FractionDigits>2</v8:FractionDigits>
+				<v8:AllowedSign>Any</v8:AllowedSign>
+			</v8:NumberQualifiers>
 		</valueType>
 		<value xsi:type="xs:decimal">0</value>
 	</parameter>