Add Calibrate AI Control UI and fleet LLM backend wiring.

Operators toggle Logic gates vs AI Control on Settings, refresh local Ollama models, and save ai_endpoint settings via Calibrate PUT; server scheduler and agent snapshot/command paths support stateless 60s fleet decisions.

server/internal/ai/client.go

@@ -0,0 +1,143 @@
+package ai
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"strings"
+	"time"
+)
+
+var defaultHTTPClient = &http.Client{Timeout: 45 * time.Second}
+
+// ListModels GET {endpoint}/models — OpenAI-compatible model list.
+func ListModels(ctx context.Context, endpoint string) ([]string, error) {
+	return ListModelsWithClient(ctx, endpoint, defaultHTTPClient)
+}
+
+func ListModelsWithClient(ctx context.Context, endpoint string, client *http.Client) ([]string, error) {
+	base := normalizeEndpoint(endpoint)
+	if base == "" {
+		return nil, fmt.Errorf("endpoint is required")
+	}
+	if client == nil {
+		client = defaultHTTPClient
+	}
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, base+"/models", nil)
+	if err != nil {
+		return nil, err
+	}
+	resp, err := client.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+	body, _ := io.ReadAll(io.LimitReader(resp.Body, 1<<20))
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("models: status %d: %s", resp.StatusCode, strings.TrimSpace(string(body)))
+	}
+	var out struct {
+		Data []struct {
+			ID string `json:"id"`
+		} `json:"data"`
+		Models []struct {
+			Name string `json:"name"`
+		} `json:"models"`
+	}
+	if err := json.Unmarshal(body, &out); err != nil {
+		return nil, fmt.Errorf("models: parse: %w", err)
+	}
+	names := make([]string, 0)
+	seen := map[string]bool{}
+	for _, m := range out.Data {
+		id := strings.TrimSpace(m.ID)
+		if id != "" && !seen[id] {
+			seen[id] = true
+			names = append(names, id)
+		}
+	}
+	for _, m := range out.Models {
+		name := strings.TrimSpace(m.Name)
+		if name != "" && !seen[name] {
+			seen[name] = true
+			names = append(names, name)
+		}
+	}
+	return names, nil
+}
+
+// Decide POST chat/completions — single turn, no conversation history.
+func Decide(ctx context.Context, endpoint, model, systemPrompt, userPrompt string) (string, error) {
+	return DecideWithClient(ctx, endpoint, model, systemPrompt, userPrompt, defaultHTTPClient)
+}
+
+func DecideWithClient(ctx context.Context, endpoint, model, systemPrompt, userPrompt string, client *http.Client) (string, error) {
+	base := normalizeEndpoint(endpoint)
+	if base == "" {
+		return "", fmt.Errorf("endpoint is required")
+	}
+	if client == nil {
+		client = defaultHTTPClient
+	}
+	if strings.TrimSpace(model) == "" {
+		model = "llama3.2"
+	}
+	payload := map[string]interface{}{
+		"model": model,
+		"messages": []map[string]string{
+			{"role": "system", "content": systemPrompt},
+			{"role": "user", "content": userPrompt},
+		},
+		"stream": false,
+	}
+	body, _ := json.Marshal(payload)
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost, base+"/chat/completions", bytes.NewReader(body))
+	if err != nil {
+		return "", err
+	}
+	req.Header.Set("Content-Type", "application/json")
+	resp, err := client.Do(req)
+	if err != nil {
+		return "", err
+	}
+	defer resp.Body.Close()
+	raw, _ := io.ReadAll(io.LimitReader(resp.Body, 1<<20))
+	if resp.StatusCode != http.StatusOK {
+		return "", fmt.Errorf("completions: status %d: %s", resp.StatusCode, strings.TrimSpace(string(raw)))
+	}
+	var completion struct {
+		Choices []struct {
+			Message struct {
+				Content string `json:"content"`
+			} `json:"message"`
+		} `json:"choices"`
+		Error *struct {
+			Message string `json:"message"`
+		} `json:"error"`
+	}
+	if err := json.Unmarshal(raw, &completion); err != nil {
+		return "", fmt.Errorf("completions: parse: %w", err)
+	}
+	if completion.Error != nil && completion.Error.Message != "" {
+		return "", fmt.Errorf("completions: %s", completion.Error.Message)
+	}
+	if len(completion.Choices) == 0 {
+		return "", fmt.Errorf("completions: empty choices")
+	}
+	return strings.TrimSpace(completion.Choices[0].Message.Content), nil
+}
+
+func normalizeEndpoint(endpoint string) string {
+	endpoint = strings.TrimSpace(endpoint)
+	endpoint = strings.TrimRight(endpoint, "/")
+	if endpoint == "" {
+		return ""
+	}
+	if !strings.HasSuffix(endpoint, "/v1") {
+		endpoint += "/v1"
+	}
+	return endpoint
+}