Add SDK usage examples

Four runnable TypeScript examples covering basic usage, custom client
configuration, error handling, and batch classification.

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

sdk-js/examples/basic.ts

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+import { query_intent } from "@botcierge/sdk";
+
+const result = await query_intent("I have food to share");
+console.log(`Domain:     ${result.domain}`);
+console.log(`Intent:     ${result.intent}`);
+console.log(`Confidence: ${result.confidence}`);

sdk-js/examples/batch.ts

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+import { Botcierge } from "@botcierge/sdk";
+
+const client = new Botcierge();
+
+const utterances = [
+  "I'm hungry",
+  "I want to remember something",
+  "I want to buy a package",
+  "Create a flow plan for tomorrow",
+];
+
+const results = await Promise.all(utterances.map(u => client.query_intent(u)));
+
+results.forEach((r, i) => {
+  console.log(`"${utterances[i]}"`);
+  console.log(`  → ${r.domain} / ${r.intent} [${r.confidence}]`);
+  console.log();
+});

sdk-js/examples/custom-client.ts

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+import { Botcierge } from "@botcierge/sdk";
+
+const client = new Botcierge({ baseUrl: "http://staging.botcierge.com:8000" });
+
+const result = await client.query_intent("I need a small loan");
+console.log(result);

sdk-js/examples/error-handling.ts

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+import { query_intent } from "@botcierge/sdk";
+
+try {
+  const result = await query_intent("I want to add an item to my shopping list");
+  console.log(`${result.intent} (${result.confidence})`);
+} catch (err) {
+  console.error("Classification failed:", (err as Error).message);
+}