feat: Template-Spec v1 Phase C — IF-Renderer + HOSTING/FEATURES + 4 neue DE-Templates

- contextBridge.ts: HostingCtx + FeaturesCtx (35 Felder), ~50 neue Platzhalter-Aliases
- ruleEngine.ts: buildBoolContext() + applyConditionalBlocks() (IF/IF_NOT/IF_ANY)
- ruleEngine.test.ts: 67 Tests (+18 für Phase C), alle grün
- page.tsx: IF-Renderer in Pipeline, HOSTING+FEATURES Formular-Sections, erweiterter SDK-Prefill
- scripts/apply_templates_023.py: 4 neue DE-Templates (Cookie v2, DSE, AGB, Impressum)
- migrations/023_new_templates_de.sql: Dokumentation + Verifikations-Query

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend-compliance/migrations/023_new_templates_de.sql

@@ -0,0 +1,54 @@
+-- Migration 023: New DE Document Templates with {{#IF}} Block Syntax
+-- ============================================================
+-- This migration adds 4 new German document templates that use
+-- the {{#IF CONDITION}}...{{/IF}} conditional block syntax
+-- introduced in Template-Spec v1 Phase C.
+--
+-- Templates inserted (via Python script: scripts/apply_templates_023.py):
+--
+--   document_type       | language | title
+--   ────────────────────┼──────────┼─────────────────────────────────────────────
+--   cookie_banner       | de       | Cookie-Banner Texte v2 (DSGVO/TDDDG, IF-Blöcke)
+--   privacy_policy      | de       | Datenschutzerklärung (DSGVO-konform, IF-Blöcke)
+--   agb                 | de       | AGB SaaS/Cloud DE (B2B/B2C, IF-Blöcke)
+--   impressum           | de       | Impressum DE (DDG § 5, IF-Blöcke)
+--
+-- Conditional syntax supported in templates:
+--   {{#IF CONDITION}}...{{/IF}}
+--   {{#IF_NOT CONDITION}}...{{/IF_NOT}}
+--   {{#IF_ANY COND_A COND_B COND_C}}...{{/IF_ANY}}
+--
+-- Boolean conditions are evaluated by applyConditionalBlocks() in ruleEngine.ts
+-- using the combined boolCtx from buildBoolContext(ctx, computedFlags).
+--
+-- No schema changes required — templates are inserted into the existing
+-- public.compliance_legal_templates table.
+--
+-- Run the Python migration script:
+--   docker cp scripts/apply_templates_023.py bp-compliance-backend:/tmp/
+--   docker exec bp-compliance-backend python3 /tmp/apply_templates_023.py
+-- ============================================================
+
+-- Verify templates were inserted (run after script):
+SELECT
+    document_type,
+    language,
+    title,
+    version,
+    is_active,
+    LENGTH(content) AS content_length,
+    array_length(placeholders, 1) AS placeholder_count,
+    created_at
+FROM public.compliance_legal_templates
+WHERE document_type IN ('cookie_banner', 'privacy_policy', 'agb', 'impressum')
+  AND language = 'de'
+ORDER BY document_type;
+
+-- Count {{#IF}} blocks per template:
+SELECT
+    document_type,
+    title,
+    (LENGTH(content) - LENGTH(REPLACE(content, '{{#IF ', ''))) / LENGTH('{{#IF ') AS if_block_count
+FROM public.compliance_legal_templates
+WHERE document_type IN ('cookie_banner', 'privacy_policy', 'agb', 'impressum')
+  AND language = 'de';