Add read-only web UI

Serves Pete's classified-story archive over HTTP alongside the Matrix
bot. Three sections (gaming/tech/politics), Animal-Crossing-vibe Tailwind
templates, day/night palette driven by the visitor's browser clock.
Web port configurable via web.listen_addr and ${PETE_WEB_PORT} in
docker-compose. Tailwind built in a node stage in the Dockerfile so
deployments don't need node at runtime.

internal/config/config.go

@@ -17,9 +17,18 @@ type Config struct {
 	Ollama  OllamaConfig   `yaml:"ollama"`
 	Posting PostingConfig  `yaml:"posting"`
 	Storage StorageConfig  `yaml:"storage"`
+	Web     WebConfig      `yaml:"web"`
 	Sources []SourceConfig `yaml:"sources"`
 }
 
+// WebConfig controls the read-only HTTP interface (news.parodia.dev style).
+type WebConfig struct {
+	Enabled    bool   `yaml:"enabled"`
+	ListenAddr string `yaml:"listen_addr"` // e.g. ":8080" or "127.0.0.1:8080"
+	SiteTitle  string `yaml:"site_title"`  // display name in the header
+	BaseURL    string `yaml:"base_url"`    // public URL (used in metadata only)
+}
+
 type MatrixConfig struct {
 	Homeserver  string            `yaml:"homeserver"`
 	UserID      string            `yaml:"user_id"`
@@ -178,6 +187,12 @@ func (c *Config) applyDefaults() {
 	if c.Storage.ClassificationLogDays == 0 {
 		c.Storage.ClassificationLogDays = 7
 	}
+	if c.Web.ListenAddr == "" {
+		c.Web.ListenAddr = ":8080"
+	}
+	if c.Web.SiteTitle == "" {
+		c.Web.SiteTitle = "Pete"
+	}
 	for i := range c.Sources {
 		if c.Sources[i].PollIntervalMinutes == 0 {
 			c.Sources[i].PollIntervalMinutes = 20