feat: edu-search-service migriert, voice-service/geo-service entfernt

- edu-search-service von breakpilot-pwa nach breakpilot-lehrer kopiert (ohne vendor)
- opensearch + edu-search-service in docker-compose.yml hinzugefuegt
- voice-service aus docker-compose.yml entfernt (jetzt in breakpilot-core)
- geo-service aus docker-compose.yml entfernt (nicht mehr benoetigt)
- CI/CD: edu-search-service zu Gitea Actions und Woodpecker hinzugefuegt
  (Go lint, test mit go mod download, build, SBOM)

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

edu-search-service/internal/config/config.go

@@ -0,0 +1,127 @@
+package config
+
+import (
+	"os"
+	"strconv"
+)
+
+type Config struct {
+	// Server
+	Port string
+
+	// OpenSearch
+	OpenSearchURL      string
+	OpenSearchUsername string
+	OpenSearchPassword string
+	IndexName          string
+
+	// Crawler
+	UserAgent       string
+	RateLimitPerSec float64
+	MaxDepth        int
+	MaxPagesPerRun  int
+
+	// Paths
+	SeedsDir string
+	RulesDir string
+
+	// API
+	APIKey string
+
+	// Backend Integration
+	BackendURL   string // URL to Python Backend for Seeds API
+	SeedsFromAPI bool   // If true, fetch seeds from API instead of files
+
+	// Embedding/Semantic Search
+	EmbeddingProvider   string // "openai", "ollama", or "none"
+	OpenAIAPIKey        string // API Key for OpenAI embeddings
+	EmbeddingModel      string // Model name (e.g., "text-embedding-3-small")
+	EmbeddingDimension  int    // Vector dimension (1536 for OpenAI small)
+	OllamaURL           string // Ollama base URL for local embeddings
+	SemanticSearchEnabled bool  // Enable semantic search features
+
+	// Scheduler
+	SchedulerEnabled  bool   // Enable automatic crawl scheduling
+	SchedulerInterval string // Crawl interval (e.g., "24h", "168h" for weekly)
+
+	// PostgreSQL (for Staff/Publications database)
+	DBHost     string
+	DBPort     string
+	DBUser     string
+	DBPassword string
+	DBName     string
+	DBSSLMode  string
+
+	// Staff Crawler
+	StaffCrawlerEmail string // Contact email for CrossRef polite pool
+}
+
+func Load() *Config {
+	return &Config{
+		Port:               getEnv("PORT", "8084"),
+		OpenSearchURL:      getEnv("OPENSEARCH_URL", "http://opensearch:9200"),
+		OpenSearchUsername: getEnv("OPENSEARCH_USERNAME", "admin"),
+		OpenSearchPassword: getEnv("OPENSEARCH_PASSWORD", "admin"),
+		IndexName:          getEnv("INDEX_NAME", "bp_documents_v1"),
+		UserAgent:          getEnv("USER_AGENT", "BreakpilotEduCrawler/1.0 (+contact: security@breakpilot.com)"),
+		RateLimitPerSec:    getEnvFloat("RATE_LIMIT_PER_SEC", 0.2),
+		MaxDepth:           getEnvInt("MAX_DEPTH", 4),
+		MaxPagesPerRun:     getEnvInt("MAX_PAGES_PER_RUN", 500),
+		SeedsDir:           getEnv("SEEDS_DIR", "./seeds"),
+		RulesDir:           getEnv("RULES_DIR", "./rules"),
+		APIKey:             getEnv("EDU_SEARCH_API_KEY", ""),
+		BackendURL:         getEnv("BACKEND_URL", "http://backend:8000"),
+		SeedsFromAPI:       getEnvBool("SEEDS_FROM_API", true),
+		// Embedding/Semantic Search
+		EmbeddingProvider:     getEnv("EMBEDDING_PROVIDER", "none"), // "openai", "ollama", or "none"
+		OpenAIAPIKey:          getEnv("OPENAI_API_KEY", ""),
+		EmbeddingModel:        getEnv("EMBEDDING_MODEL", "text-embedding-3-small"),
+		EmbeddingDimension:    getEnvInt("EMBEDDING_DIMENSION", 1536),
+		OllamaURL:             getEnv("OLLAMA_URL", "http://ollama:11434"),
+		SemanticSearchEnabled: getEnvBool("SEMANTIC_SEARCH_ENABLED", false),
+		// Scheduler
+		SchedulerEnabled:  getEnvBool("SCHEDULER_ENABLED", false),
+		SchedulerInterval: getEnv("SCHEDULER_INTERVAL", "24h"),
+		// PostgreSQL
+		DBHost:     getEnv("DB_HOST", "postgres"),
+		DBPort:     getEnv("DB_PORT", "5432"),
+		DBUser:     getEnv("DB_USER", "postgres"),
+		DBPassword: getEnv("DB_PASSWORD", "postgres"),
+		DBName:     getEnv("DB_NAME", "breakpilot"),
+		DBSSLMode:  getEnv("DB_SSLMODE", "disable"),
+		// Staff Crawler
+		StaffCrawlerEmail: getEnv("STAFF_CRAWLER_EMAIL", "crawler@breakpilot.de"),
+	}
+}
+
+func getEnvBool(key string, fallback bool) bool {
+	if value := os.Getenv(key); value != "" {
+		return value == "true" || value == "1" || value == "yes"
+	}
+	return fallback
+}
+
+func getEnv(key, fallback string) string {
+	if value := os.Getenv(key); value != "" {
+		return value
+	}
+	return fallback
+}
+
+func getEnvInt(key string, fallback int) int {
+	if value := os.Getenv(key); value != "" {
+		if i, err := strconv.Atoi(value); err == nil {
+			return i
+		}
+	}
+	return fallback
+}
+
+func getEnvFloat(key string, fallback float64) float64 {
+	if value := os.Getenv(key); value != "" {
+		if f, err := strconv.ParseFloat(value, 64); err == nil {
+			return f
+		}
+	}
+	return fallback
+}