feat: Add LaTeX template-based form filling for G2210-11

Replace unreliable visual overlay mode with precise LaTeX templates:

- Add LaTeX template for G2210-11 (Ärztlicher Befundbericht der WAG)
- Create Python Flask backend for LaTeX compilation (latex_service.py, server.py)
- Add frontend latexService.ts for API communication
- Update ReviewPanel with LaTeX mode toggle and preview
- Enhance Gemini prompts with G2210-11 specific field extraction
- Add Dockerfile with TeX Live for Railway deployment
- Update railway.toml to use Docker builder

The LaTeX approach ensures accurate field placement and proper
formatting for German medical/insurance forms.

https://claude.ai/code/session_016pQhdznHZ74Fpkvwr3cLBq

services/geminiService.ts

@@ -2,6 +2,7 @@ import { GoogleGenAI, Type, Schema } from "@google/genai";
 import { FileData, FormResponse } from "../types";
 import { PdfFieldInfo } from "./pdfService";
 import { getApiKey } from "./apiKeyService";
+import { detectTemplate, getExpectedFields } from "./latexService";
 
 const getAI = () => {
   const apiKey = getApiKey();
@@ -75,12 +76,98 @@ const responseSchema: Schema = {
   required: ["fields", "summary"]
 };
 
+// G2210-11 specific field definitions for better extraction
+const G2210_FIELDS = `
+REQUIRED FIELDS FOR G2210-11 (Ärztlicher Befundbericht):
+Extract ALL of the following fields from the source document:
+
+PATIENT DATA:
+- Versicherungsnummer (e.g., "12 345678 A 123")
+- ABT.-Nr. (Aktenzeichen/Abteilungsnummer)
+- Name, Vorname (Full name: "Nachname, Vorname")
+- Geburtsdatum (format: DD.MM.YYYY)
+- Geschlecht (männlich/weiblich/divers)
+- Straße, Hausnummer
+- PLZ
+- Ort
+- Telefon
+- Krankenkasse
+
+EMPLOYMENT:
+- Derzeitige Tätigkeit (Beruf)
+- Arbeitgeber
+- Arbeitsunfähig seit (date: DD.MM.YYYY)
+- Letzte Arbeitsaufnahme
+
+DIAGNOSES (up to 6, with ICD-10 codes):
+- Diagnose 1 + Diagnose 1 ICD
+- Diagnose 2 + Diagnose 2 ICD
+- Diagnose 3 + Diagnose 3 ICD
+- Diagnose 4 + Diagnose 4 ICD
+- Diagnose 5 + Diagnose 5 ICD
+- Diagnose 6 + Diagnose 6 ICD
+
+ANAMNESIS:
+- Anamnese/Beschwerden (patient symptoms and history)
+- Krankheitsverlauf (disease progression, previous treatments)
+- Körperlicher Befund (physical examination findings)
+
+FUNCTIONAL LIMITATIONS (mark as "keine", "gering", or "erheblich"):
+- Mobilität keine/gering/erheblich
+- Selbstversorgung keine/gering/erheblich
+- Haushaltsführung keine/gering/erheblich
+- Erwerbstätigkeit keine/gering/erheblich
+- Kommunikation keine/gering/erheblich
+- Psychische Belastbarkeit keine/gering/erheblich
+- Beeinträchtigungen Erläuterung
+
+MEDICATION (up to 5):
+- Medikament 1 + Medikament 1 Dosis + Medikament 1 Seit
+- Medikament 2 + Medikament 2 Dosis + Medikament 2 Seit
+- Medikament 3 + Medikament 3 Dosis + Medikament 3 Seit
+- Medikament 4 + Medikament 4 Dosis + Medikament 4 Seit
+- Medikament 5 + Medikament 5 Dosis + Medikament 5 Seit
+- Physikalische Therapie
+
+PREVIOUS REHABILITATION:
+- Reha 1 Zeitraum + Reha 1 Einrichtung + Reha 1 Erfolg
+- Reha 2 Zeitraum + Reha 2 Einrichtung + Reha 2 Erfolg
+
+ASSESSMENT:
+- Leistungsvermögen (vollschichtig/3-6 Stunden/unter 3 Stunden)
+- Rehabilitationsbedürftigkeit (reasoning for rehab need)
+- Rehabilitationsziel
+- Rehabilitationsform (stationär/ambulant/ganztägig ambulant)
+- Reha Einrichtung Empfehlung
+
+TRAVEL:
+- Reisefähig (ja/nein)
+- Reisefähig Begründung (if no)
+- Begleitperson (ja/nein)
+
+ADDITIONAL:
+- Ergänzende Angaben
+
+DOCTOR INFORMATION:
+- Arzt Name
+- Facharztbezeichnung
+- Praxis Anschrift
+- Praxis Telefon
+- BSNR
+- LANR
+- Unterschrift Datum
+`;
+
 export const processDocuments = async (
   blankForm: FileData,
   sourceDocument: FileData,
   pdfFields: PdfFieldInfo[] = []
 ): Promise<FormResponse> => {
-  
+
+  // Detect if we have a known template
+  const detectedTemplate = detectTemplate(blankForm.file?.name || '');
+  const expectedFields = detectedTemplate ? getExpectedFields(detectedTemplate) : [];
+
   const formPart = {
     inlineData: {
       data: blankForm.base64,
@@ -98,11 +185,34 @@ export const processDocuments = async (
   let systemPrompt = `
     ROLE: Intelligent Document Processing AI (Verification Expert).
     TASK: Extract data from the SOURCE DOCUMENT and map it to the BLANK TARGET FORM.
-    
+
     CRITICAL INSTRUCTION: You must verify every extraction. If a value is ambiguous, plausibility is low, or you are guessing, set validation.status to 'WARNING' and explain why in validation.message.
   `;
 
-  if (pdfFields.length > 0) {
+  // Add template-specific instructions
+  if (detectedTemplate === 'G2210-11') {
+    systemPrompt += `
+      DETECTED FORM: G2210-11 (Ärztlicher Befundbericht der DRV Westfalen)
+
+      ${G2210_FIELDS}
+
+      IMPORTANT INSTRUCTIONS:
+      1. Extract ALL fields listed above, even if they are empty in the source.
+      2. Use the EXACT label names as listed above for each field.
+      3. For multi-value fields like diagnoses and medications, create separate field entries.
+      4. For checkbox fields (Mobilität, Selbstversorgung, etc.), return separate fields for each option.
+         Example: If mobility is "erheblich", return:
+         - "Mobilität keine" with value ""
+         - "Mobilität gering" with value ""
+         - "Mobilität erheblich" with value "true"
+      5. ICD-10 codes must be in standard format (e.g., "M54.5", "F32.1")
+      6. Dates must be in DD.MM.YYYY format.
+      7. For Leistungsvermögen, return separate checkbox fields:
+         - "Leistungsvermögen vollschichtig" (true/false)
+         - "Leistungsvermögen 3-6 Stunden" (true/false)
+         - "Leistungsvermögen unter 3 Stunden" (true/false)
+    `;
+  } else if (pdfFields.length > 0) {
     const fieldList = pdfFields.map(f => `"${f.name}" (${f.type})`).join(", ");
     systemPrompt += `
       MODE: FILLABLE PDF (AcroForm).
@@ -110,12 +220,18 @@ export const processDocuments = async (
       Map extracted data to these exact field IDs: [${fieldList}].
       Return the 'key' property matching the field ID.
     `;
+  } else if (expectedFields.length > 0) {
+    systemPrompt += `
+      MODE: TEMPLATE-BASED EXTRACTION.
+      Extract the following specific fields: [${expectedFields.join(", ")}].
+      Use these exact label names in your response.
+    `;
   } else {
     systemPrompt += `
       MODE: VISUAL FILLING (Flat/XFA/Scan).
       The target form DOES NOT have accessible digital fields.
       You must VISUALLY locate where the text should be written.
-      
+
       For every field you identify on the TARGET FORM:
       1. Extract the corresponding value from the SOURCE DOCUMENT.
       2. Estimate the VISUAL COORDINATES [pageIndex, x, y] where the text should start.
@@ -123,7 +239,7 @@ export const processDocuments = async (
          - (0,0) is the top-left corner of the page.
          - (1000,1000) is the bottom-right corner.
          - Align text slightly above lines or inside boxes.
-      
+
       For checkboxes: If true/yes, the value should be "X" placed inside the box.
     `;
   }