fix: Restore all files lost during destructive rebase

A previous `git pull --rebase origin main` dropped 177 local commits,
losing 3400+ files across admin-v2, backend, studio-v2, website,
klausur-service, and many other services. The partial restore attempt
(660295e2) only recovered some files.

This commit restores all missing files from pre-rebase ref 98933f5e
while preserving post-rebase additions (night-scheduler, night-mode UI,
NightModeWidget dashboard integration).

Restored features include:
- AI Module Sidebar (FAB), OCR Labeling, OCR Compare
- GPU Dashboard, RAG Pipeline, Magic Help
- Klausur-Korrektur (8 files), Abitur-Archiv (5+ files)
- Companion, Zeugnisse-Crawler, Screen Flow
- Full backend, studio-v2, website, klausur-service
- All compliance SDKs, agent-core, voice-service
- CI/CD configs, documentation, scripts

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

edu-search-service/internal/crawler/api_client.go

@@ -0,0 +1,183 @@
+package crawler
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"time"
+)
+
+// SeedFromAPI represents a seed URL from the Backend API
+type SeedFromAPI struct {
+	URL      string  `json:"url"`
+	Trust    float64 `json:"trust"`
+	Source   string  `json:"source"`   // GOV, EDU, UNI, etc.
+	Scope    string  `json:"scope"`    // FEDERAL, STATE, etc.
+	State    string  `json:"state"`    // BW, BY, etc. (optional)
+	Depth    int     `json:"depth"`    // Crawl depth for this seed
+	Category string  `json:"category"` // Category name
+}
+
+// SeedsExportResponse represents the API response from /seeds/export/for-crawler
+type SeedsExportResponse struct {
+	Seeds      []SeedFromAPI `json:"seeds"`
+	Total      int           `json:"total"`
+	ExportedAt string        `json:"exported_at"`
+}
+
+// APIClient handles communication with the Python Backend
+type APIClient struct {
+	baseURL    string
+	httpClient *http.Client
+}
+
+// NewAPIClient creates a new API client for fetching seeds
+func NewAPIClient(backendURL string) *APIClient {
+	return &APIClient{
+		baseURL: backendURL,
+		httpClient: &http.Client{
+			Timeout: 30 * time.Second,
+		},
+	}
+}
+
+// FetchSeeds retrieves enabled seeds from the Backend API
+func (c *APIClient) FetchSeeds(ctx context.Context) (*SeedsExportResponse, error) {
+	url := fmt.Sprintf("%s/v1/edu-search/seeds/export/for-crawler", c.baseURL)
+
+	req, err := http.NewRequestWithContext(ctx, "GET", url, nil)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create request: %w", err)
+	}
+
+	req.Header.Set("Accept", "application/json")
+	req.Header.Set("User-Agent", "EduSearchCrawler/1.0")
+
+	resp, err := c.httpClient.Do(req)
+	if err != nil {
+		return nil, fmt.Errorf("failed to fetch seeds: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		body, _ := io.ReadAll(resp.Body)
+		return nil, fmt.Errorf("API returned status %d: %s", resp.StatusCode, string(body))
+	}
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read response: %w", err)
+	}
+
+	var result SeedsExportResponse
+	if err := json.Unmarshal(body, &result); err != nil {
+		return nil, fmt.Errorf("failed to parse response: %w", err)
+	}
+
+	return &result, nil
+}
+
+// CrawlStatusReport represents a crawl status to report to the Backend
+type CrawlStatusReport struct {
+	SeedURL          string  `json:"seed_url"`
+	Status           string  `json:"status"` // "success", "error", "partial"
+	DocumentsCrawled int     `json:"documents_crawled"`
+	ErrorMessage     string  `json:"error_message,omitempty"`
+	CrawlDuration    float64 `json:"crawl_duration_seconds"`
+}
+
+// CrawlStatusResponse represents the response from crawl status endpoint
+type CrawlStatusResponse struct {
+	Success bool   `json:"success"`
+	SeedURL string `json:"seed_url"`
+	Message string `json:"message"`
+}
+
+// BulkCrawlStatusResponse represents the response from bulk crawl status endpoint
+type BulkCrawlStatusResponse struct {
+	Updated int      `json:"updated"`
+	Failed  int      `json:"failed"`
+	Errors  []string `json:"errors"`
+}
+
+// ReportStatus sends crawl status for a single seed to the Backend
+func (c *APIClient) ReportStatus(ctx context.Context, report *CrawlStatusReport) error {
+	url := fmt.Sprintf("%s/v1/edu-search/seeds/crawl-status", c.baseURL)
+
+	body, err := json.Marshal(report)
+	if err != nil {
+		return fmt.Errorf("failed to marshal report: %w", err)
+	}
+
+	req, err := http.NewRequestWithContext(ctx, "POST", url, bytes.NewReader(body))
+	if err != nil {
+		return fmt.Errorf("failed to create request: %w", err)
+	}
+
+	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("Accept", "application/json")
+	req.Header.Set("User-Agent", "EduSearchCrawler/1.0")
+
+	resp, err := c.httpClient.Do(req)
+	if err != nil {
+		return fmt.Errorf("failed to report status: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		respBody, _ := io.ReadAll(resp.Body)
+		return fmt.Errorf("API returned status %d: %s", resp.StatusCode, string(respBody))
+	}
+
+	return nil
+}
+
+// ReportStatusBulk sends crawl status for multiple seeds in one request
+func (c *APIClient) ReportStatusBulk(ctx context.Context, reports []*CrawlStatusReport) (*BulkCrawlStatusResponse, error) {
+	url := fmt.Sprintf("%s/v1/edu-search/seeds/crawl-status/bulk", c.baseURL)
+
+	payload := struct {
+		Updates []*CrawlStatusReport `json:"updates"`
+	}{
+		Updates: reports,
+	}
+
+	body, err := json.Marshal(payload)
+	if err != nil {
+		return nil, fmt.Errorf("failed to marshal reports: %w", err)
+	}
+
+	req, err := http.NewRequestWithContext(ctx, "POST", url, bytes.NewReader(body))
+	if err != nil {
+		return nil, fmt.Errorf("failed to create request: %w", err)
+	}
+
+	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("Accept", "application/json")
+	req.Header.Set("User-Agent", "EduSearchCrawler/1.0")
+
+	resp, err := c.httpClient.Do(req)
+	if err != nil {
+		return nil, fmt.Errorf("failed to report status: %w", err)
+	}
+	defer resp.Body.Close()
+
+	respBody, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read response: %w", err)
+	}
+
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("API returned status %d: %s", resp.StatusCode, string(respBody))
+	}
+
+	var result BulkCrawlStatusResponse
+	if err := json.Unmarshal(respBody, &result); err != nil {
+		return nil, fmt.Errorf("failed to parse response: %w", err)
+	}
+
+	return &result, nil
+}