feat: initial CodeBoard monorepo scaffold

Turborepo monorepo with npm workspaces:
- apps/web: Next.js 14 frontend with Tailwind v4, SSE progress, doc viewer
- apps/worker: BullMQ job processor (clone → parse → LLM generate)
- packages/shared: TypeScript types
- packages/parser: Babel-based AST parser (JS/TS) + regex (Python)
- packages/llm: OpenAI/Anthropic provider abstraction + prompt pipeline
- packages/diagrams: Mermaid architecture & dependency graph generators
- packages/database: Prisma schema (PostgreSQL)
- Docker multi-stage build (web + worker targets)

All packages compile successfully with tsc and next build.

packages/parser/src/languages/python.ts

@@ -0,0 +1,157 @@
+import type {
+  FileNode,
+  FunctionNode,
+  ClassNode,
+  ImportNode,
+  ExportNode,
+} from "@codeboard/shared";
+import type { LanguageParser } from "./base.js";
+
+const FUNC_RE = /^(\s*)def\s+(\w+)\s*\(([^)]*)\)(?:\s*->\s*([^:]+))?\s*:/gm;
+const CLASS_RE = /^(\s*)class\s+(\w+)(?:\(([^)]*)\))?\s*:/gm;
+const IMPORT_RE = /^(?:from\s+([\w.]+)\s+)?import\s+(.+)$/gm;
+const DOCSTRING_RE = /^\s*(?:"""([\s\S]*?)"""|'''([\s\S]*?)''')/;
+
+function parseParams(raw: string): string[] {
+  if (!raw.trim()) return [];
+  return raw
+    .split(",")
+    .map((p) => p.trim().split(":")[0].split("=")[0].trim())
+    .filter((p) => p && p !== "self" && p !== "cls");
+}
+
+export const pythonParser: LanguageParser = {
+  extensions: [".py"],
+
+  parse(content: string, filePath: string): FileNode {
+    const lines = content.split("\n");
+    const functions: FunctionNode[] = [];
+    const classes: ClassNode[] = [];
+    const imports: ImportNode[] = [];
+    const exports: ExportNode[] = [];
+
+    let match: RegExpExecArray | null;
+
+    FUNC_RE.lastIndex = 0;
+    while ((match = FUNC_RE.exec(content)) !== null) {
+      const indent = match[1].length;
+      const name = match[2];
+      const params = parseParams(match[3]);
+      const returnType = match[4]?.trim();
+      const lineStart =
+        content.substring(0, match.index).split("\n").length;
+
+      let lineEnd = lineStart;
+      for (let i = lineStart; i < lines.length; i++) {
+        const line = lines[i];
+        if (
+          i > lineStart &&
+          line.trim() &&
+          !line.startsWith(" ".repeat(indent + 1)) &&
+          !line.startsWith("\t".repeat(indent === 0 ? 1 : indent))
+        ) {
+          lineEnd = i;
+          break;
+        }
+        lineEnd = i + 1;
+      }
+
+      let docstring: string | undefined;
+      if (lineStart < lines.length) {
+        const bodyStart = lines.slice(lineStart, lineStart + 5).join("\n");
+        const docMatch = DOCSTRING_RE.exec(bodyStart);
+        if (docMatch) {
+          docstring = (docMatch[1] ?? docMatch[2]).trim();
+        }
+      }
+
+      if (indent === 0) {
+        functions.push({
+          name,
+          params,
+          returnType,
+          lineStart,
+          lineEnd,
+          docstring,
+          calls: [],
+        });
+      }
+    }
+
+    CLASS_RE.lastIndex = 0;
+    while ((match = CLASS_RE.exec(content)) !== null) {
+      const name = match[2];
+      const methods: FunctionNode[] = [];
+      const classLineStart =
+        content.substring(0, match.index).split("\n").length;
+
+      const classBody = content.substring(match.index + match[0].length);
+      const methodRe = /^\s{2,}def\s+(\w+)\s*\(([^)]*)\)(?:\s*->\s*([^:]+))?\s*:/gm;
+      let methodMatch: RegExpExecArray | null;
+      while ((methodMatch = methodRe.exec(classBody)) !== null) {
+        const methodLineStart =
+          classLineStart +
+          classBody.substring(0, methodMatch.index).split("\n").length;
+        methods.push({
+          name: methodMatch[1],
+          params: parseParams(methodMatch[2]),
+          returnType: methodMatch[3]?.trim(),
+          lineStart: methodLineStart,
+          lineEnd: methodLineStart + 1,
+          calls: [],
+        });
+      }
+
+      classes.push({ name, methods, properties: [] });
+    }
+
+    IMPORT_RE.lastIndex = 0;
+    while ((match = IMPORT_RE.exec(content)) !== null) {
+      const fromModule = match[1];
+      const importedNames = match[2]
+        .split(",")
+        .map((s) => s.trim().split(" as ")[0].trim())
+        .filter(Boolean);
+
+      if (fromModule) {
+        imports.push({ source: fromModule, specifiers: importedNames });
+      } else {
+        for (const name of importedNames) {
+          imports.push({ source: name, specifiers: [name] });
+        }
+      }
+    }
+
+    const allRe = /^__all__\s*=\s*\[([^\]]*)\]/m;
+    const allMatch = allRe.exec(content);
+    if (allMatch) {
+      const names = allMatch[1]
+        .split(",")
+        .map((s) => s.trim().replace(/['"]/g, ""))
+        .filter(Boolean);
+      for (const name of names) {
+        exports.push({ name, isDefault: false });
+      }
+    }
+
+    let complexity = 0;
+    for (const line of lines) {
+      const trimmed = line.trim();
+      if (trimmed.startsWith("if ") || trimmed.startsWith("elif ")) complexity++;
+      if (trimmed.startsWith("for ") || trimmed.startsWith("while ")) complexity++;
+      if (trimmed.startsWith("except")) complexity++;
+      if (trimmed.includes(" and ") || trimmed.includes(" or ")) complexity++;
+    }
+
+    return {
+      path: filePath,
+      language: "python",
+      size: content.length,
+      functions,
+      classes,
+      imports,
+      exports,
+      complexity,
+    };
+  },
+};