fix(company-profile): Projekt-aware Persistenz — Daten werden jetzt pro Projekt gespeichert

Problem: Company Profile nutzte hartcodiertes tenant_id=default ohne project_id.
Beim Wechsel zwischen Projekten wurden immer die gleichen (oder keine) Daten geladen.

Aenderungen:
- Migration 042: project_id Spalte + UNIQUE(tenant_id, project_id) Constraint,
  fehlende Spalten (offering_urls, Adressfelder) nachgetragen
- Backend: Alle Queries nutzen WHERE tenant_id + project_id IS NOT DISTINCT FROM
- Proxy: project_id Query-Parameter wird durchgereicht
- Frontend: projectId aus SDK-Context, profileApiUrl() Helper fuer alle API-Aufrufe
- "Weiter" speichert jetzt immer den Draft (war schon so, ging aber ins Leere)

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

backend-compliance/migrations/042_company_profile_project_id.sql

@@ -0,0 +1,66 @@
+-- Migration 042: Add project_id to compliance_company_profiles
+-- Enables multi-project company profiles (one profile per tenant+project)
+--
+-- Previously: UNIQUE(tenant_id) — only one profile per tenant
+-- Now: UNIQUE(tenant_id, project_id) — one profile per tenant+project
+
+BEGIN;
+
+-- 1. Add project_id column (nullable for backwards compat with existing rows)
+ALTER TABLE compliance_company_profiles
+    ADD COLUMN IF NOT EXISTS project_id UUID;
+
+-- 2. Add offering_urls column (was in frontend but missing in DB)
+ALTER TABLE compliance_company_profiles
+    ADD COLUMN IF NOT EXISTS offering_urls JSONB DEFAULT '{}'::jsonb;
+
+-- 3. Add address columns (were in frontend but missing in DB)
+ALTER TABLE compliance_company_profiles
+    ADD COLUMN IF NOT EXISTS headquarters_country_other VARCHAR(255) DEFAULT '',
+    ADD COLUMN IF NOT EXISTS headquarters_street VARCHAR(500) DEFAULT '',
+    ADD COLUMN IF NOT EXISTS headquarters_zip VARCHAR(20) DEFAULT '',
+    ADD COLUMN IF NOT EXISTS headquarters_state VARCHAR(255) DEFAULT '';
+
+-- 4. Drop old UNIQUE constraint on tenant_id alone
+DO $$
+BEGIN
+    -- The constraint might be named differently depending on how it was created
+    IF EXISTS (
+        SELECT 1 FROM pg_constraint
+        WHERE conname = 'compliance_company_profiles_tenant_id_key'
+    ) THEN
+        ALTER TABLE compliance_company_profiles
+            DROP CONSTRAINT compliance_company_profiles_tenant_id_key;
+    END IF;
+END $$;
+
+-- 5. Create new UNIQUE constraint on (tenant_id, project_id)
+-- Using COALESCE to handle NULL project_id (legacy rows)
+CREATE UNIQUE INDEX IF NOT EXISTS idx_company_profiles_tenant_project
+    ON compliance_company_profiles (tenant_id, COALESCE(project_id, '00000000-0000-0000-0000-000000000000'::uuid));
+
+-- 6. Add FK to compliance_projects (if the referenced table exists)
+DO $$
+BEGIN
+    IF EXISTS (
+        SELECT 1 FROM information_schema.tables
+        WHERE table_name = 'compliance_projects'
+    ) THEN
+        -- Only add FK if not already present
+        IF NOT EXISTS (
+            SELECT 1 FROM pg_constraint
+            WHERE conname = 'fk_company_profiles_project'
+        ) THEN
+            ALTER TABLE compliance_company_profiles
+                ADD CONSTRAINT fk_company_profiles_project
+                FOREIGN KEY (project_id) REFERENCES compliance_projects(id)
+                ON DELETE CASCADE;
+        END IF;
+    END IF;
+END $$;
+
+-- 7. Add audit log project_id column too
+ALTER TABLE compliance_company_profile_audit
+    ADD COLUMN IF NOT EXISTS project_id UUID;
+
+COMMIT;