feat: pipe/wire path building API + oni_commander.py high-level commands

New Mod endpoints:
- POST /api/action/build_pipe: build gas/liquid pipe path (x1,y1)->(x2,y2) with bridge option
- POST /api/action/build_wire: build wire path with types: regular, heavy, conductive, heavy_conductive

New Python tool: tools/oni_commander.py
High-level commands that combine multiple low-level API calls:
- diagnose: full diagnostic (power, CO2, temp, diseases, pipes)
- fix_co2: auto-detect CO2 pockets and dig vent shafts
- fix_overload: detect overloaded circuits with fix suggestions
- emergency_o2: auto-check O2 and build OxygenDiffuser/Electrolyzer
- expand_base: dig + build walls/floors in one command (one-click room expansion)
- build_pipe_line: simplified CLI for pipe path building
- build_wire_line: simplified CLI for wire path building
All high-level commands auto-pause/resume the game.

CLI: build_pipe_line, build_wire_line added to oni_api.py

tools/oni_api.py

@@ -697,6 +697,30 @@ def cmd_assign_job(args):
     })
     _print_feedback(result)
 
+# ---------------------------------------------------------------------------
+# Pipe / Wire Lines
+# ---------------------------------------------------------------------------
+
+def cmd_build_pipe_line(args):
+    """Build a pipe line. Usage: build_pipe_line <gas|liquid> <x1> <y1> <x2> <y2> [bridge]"""
+    if len(args) < 5:
+        print("Usage: build_pipe_line gas|liquid <x1> <y1> <x2> <y2> [bridge]")
+        return
+    payload = {"type": args[0], "x1": int(args[1]), "y1": int(args[2]),
+               "x2": int(args[3]), "y2": int(args[4]), "bridge": len(args) > 5 and args[5] == 'bridge'}
+    result = api_post('/api/action/build_pipe', payload)
+    _print_feedback(result)
+
+def cmd_build_wire_line(args):
+    """Build a wire line. Usage: build_wire_line <type> <x1> <y1> <x2> <y2> [bridge]"""
+    if len(args) < 5:
+        print("Usage: build_wire_line regular|heavy|conductive <x1> <y1> <x2> <y2> [bridge]")
+        return
+    payload = {"type": args[0], "x1": int(args[1]), "y1": int(args[2]),
+               "x2": int(args[3]), "y2": int(args[4]), "bridge": len(args) > 5 and args[5] == 'bridge'}
+    result = api_post('/api/action/build_wire', payload)
+    _print_feedback(result)
+
 def _print_feedback(result):
     """Pretty-print action feedback."""
     if result.get('success'):
@@ -823,6 +847,8 @@ COMMANDS = {
     'storage': cmd_storage,
     'skills': cmd_skills,
     'assign_job': cmd_assign_job,
+    'build_pipe_line': cmd_build_pipe_line,
+    'build_wire_line': cmd_build_wire_line,
 }
 
 if __name__ == '__main__':