Add context cancellation support to database operations

- Add context-aware versions of all read operations in the database
- Update handlers to use context from HTTP requests
- Allows database queries to be cancelled when HTTP requests timeout
- Prevents database operations from continuing after client disconnects

internal/routewatch/app_integration_test.go

@@ -163,6 +163,11 @@ func (m *mockStore) GetStats() (database.Stats, error) {
 	}, nil
 }
 
+// GetStatsContext returns statistics about the mock store with context support
+func (m *mockStore) GetStatsContext(ctx context.Context) (database.Stats, error) {
+	return m.GetStats()
+}
+
 // UpsertLiveRoute mock implementation
 func (m *mockStore) UpsertLiveRoute(route *database.LiveRoute) error {
 	// Simple mock - just return nil
@@ -181,12 +186,22 @@ func (m *mockStore) GetPrefixDistribution() (ipv4 []database.PrefixDistribution,
 	return nil, nil, nil
 }
 
+// GetPrefixDistributionContext mock implementation with context support
+func (m *mockStore) GetPrefixDistributionContext(ctx context.Context) (ipv4 []database.PrefixDistribution, ipv6 []database.PrefixDistribution, err error) {
+	return m.GetPrefixDistribution()
+}
+
 // GetLiveRouteCounts mock implementation
 func (m *mockStore) GetLiveRouteCounts() (ipv4Count, ipv6Count int, err error) {
 	// Return mock counts
 	return m.RouteCount / 2, m.RouteCount / 2, nil
 }
 
+// GetLiveRouteCountsContext mock implementation with context support
+func (m *mockStore) GetLiveRouteCountsContext(ctx context.Context) (ipv4Count, ipv6Count int, err error) {
+	return m.GetLiveRouteCounts()
+}
+
 // GetASInfoForIP mock implementation
 func (m *mockStore) GetASInfoForIP(ip string) (*database.ASInfo, error) {
 	// Simple mock - return a test AS
@@ -201,6 +216,11 @@ func (m *mockStore) GetASInfoForIP(ip string) (*database.ASInfo, error) {
 	}, nil
 }
 
+// GetASInfoForIPContext mock implementation with context support
+func (m *mockStore) GetASInfoForIPContext(ctx context.Context, ip string) (*database.ASInfo, error) {
+	return m.GetASInfoForIP(ip)
+}
+
 // GetASDetails mock implementation
 func (m *mockStore) GetASDetails(asn int) (*database.ASN, []database.LiveRoute, error) {
 	m.mu.Lock()
@@ -215,17 +235,32 @@ func (m *mockStore) GetASDetails(asn int) (*database.ASN, []database.LiveRoute,
 	return nil, nil, database.ErrNoRoute
 }
 
+// GetASDetailsContext mock implementation with context support
+func (m *mockStore) GetASDetailsContext(ctx context.Context, asn int) (*database.ASN, []database.LiveRoute, error) {
+	return m.GetASDetails(asn)
+}
+
 // GetPrefixDetails mock implementation
 func (m *mockStore) GetPrefixDetails(prefix string) ([]database.LiveRoute, error) {
 	// Return empty routes for now
 	return []database.LiveRoute{}, nil
 }
 
+// GetPrefixDetailsContext mock implementation with context support
+func (m *mockStore) GetPrefixDetailsContext(ctx context.Context, prefix string) ([]database.LiveRoute, error) {
+	return m.GetPrefixDetails(prefix)
+}
+
 func (m *mockStore) GetRandomPrefixesByLength(maskLength, ipVersion, limit int) ([]database.LiveRoute, error) {
 	// Return empty routes for now
 	return []database.LiveRoute{}, nil
 }
 
+// GetRandomPrefixesByLengthContext mock implementation with context support
+func (m *mockStore) GetRandomPrefixesByLengthContext(ctx context.Context, maskLength, ipVersion, limit int) ([]database.LiveRoute, error) {
+	return m.GetRandomPrefixesByLength(maskLength, ipVersion, limit)
+}
+
 // UpsertLiveRouteBatch mock implementation
 func (m *mockStore) UpsertLiveRouteBatch(routes []*database.LiveRoute) error {
 	m.mu.Lock()