feat: Tender-Analyse Pipeline — Upload, Extraction, Control-Matching

Phase 3 des Payment Compliance Moduls:
1. Backend: Tender Upload + LLM Requirement Extraction + Control Matching
   - DB Migration 025 (tender_analyses Tabelle)
   - TenderHandlers: Upload, Extract, Match, List, Get (5 Endpoints)
   - LLM-Extraktion via Anthropic API mit Keyword-Fallback
   - Control-Matching mit Domain-Bonus + Keyword-Overlap Relevance
2. Frontend: Dritter Tab "Ausschreibung" in /sdk/payment-compliance
   - PDF/TXT/Word Upload mit Drag-Area
   - Automatische Analyse-Pipeline (Upload → Extract → Match)
   - Ergebnis-Dashboard: Abgedeckt/Teilweise/Luecken
   - Requirement-by-Requirement Matching mit Control-IDs + Relevanz%
   - Gap-Beschreibung fuer nicht-gematchte Requirements
   - Analyse-Historie mit Klick-to-Detail

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ai-compliance-sdk/migrations/025_tender_analysis_schema.sql

@@ -0,0 +1,37 @@
+-- Migration 025: Tender Analysis Schema
+-- Stores uploaded tender documents, extracted requirements, and control matching results
+
+CREATE TABLE IF NOT EXISTS tender_analyses (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    tenant_id UUID NOT NULL,
+
+    -- Document
+    file_name VARCHAR(500) NOT NULL,
+    file_size BIGINT DEFAULT 0,
+    file_content BYTEA,
+
+    -- Project
+    project_name VARCHAR(500),
+    customer_name VARCHAR(500),
+
+    -- Status
+    status VARCHAR(50) DEFAULT 'uploaded',
+    -- CHECK (status IN ('uploaded', 'extracting', 'extracted', 'matched', 'completed', 'error'))
+
+    -- Extracted requirements
+    requirements JSONB DEFAULT '[]'::jsonb,
+    total_requirements INT DEFAULT 0,
+
+    -- Match results
+    match_results JSONB DEFAULT '[]'::jsonb,
+    matched_count INT DEFAULT 0,
+    unmatched_count INT DEFAULT 0,
+    partial_count INT DEFAULT 0,
+
+    -- Audit
+    created_at TIMESTAMPTZ DEFAULT NOW(),
+    updated_at TIMESTAMPTZ DEFAULT NOW()
+);
+
+CREATE INDEX IF NOT EXISTS idx_ta_tenant ON tender_analyses (tenant_id);
+CREATE INDEX IF NOT EXISTS idx_ta_status ON tender_analyses (status);