feat(train): routes planned through the instance's BRouter (ADR 0030, D44)

The routing endpoint plans a route through the waypoints for one of six
profiles, for the people signed in, at most 50 waypoints and 30 plans a
person a minute, nothing kept or logged; refused without BROUTER_URL.
BRouter's GeoJSON is read into points, elevations, climb and descent
above 3 m, turn hints and stretches by surface. Train's running profile
for BRouter, halkyon-run.brf, is a first guess not yet tried on BRouter.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>

apps/train/brouter/halkyon-run.brf

@@ -0,0 +1,135 @@
+# Halkyon Train's running profile for BRouter (ADR 0030, D44): BRouter has
+# none for running, its hiking profiles sending runners up steps and rough
+# paths, its cycling ones off footpaths. Paths, footways, tracks and quiet
+# streets first, any surface; big roads only where nothing else goes, steps
+# and scrambles avoided, motorways never. Written on BRouter's `shortest.brf`
+# (its access rules and its voice hints' classifiers kept), 28 Oct 2026; not
+# yet tried on a BRouter: the costs are a first guess, to be tuned on runs.
+
+---context:global   # following code refers to global config
+
+# A climb costs a little, as it does a runner; going down costs nothing.
+assign downhillcost 0
+assign downhillcutoff 1.5
+assign uphillcost 15
+assign uphillcutoff 1.5
+
+assign   turnInstructionMode  = 2  # locus-style, as Train asks for
+assign   validForFoot        1
+
+---context:way   # following code refers to way-tags
+
+assign turncost 0
+
+assign initialclassifier =
+     if route=ferry then 1
+     else 0
+
+assign initialcost switch route=ferry 10000 0
+
+#
+# implicit access here just from the motorroad tag
+#
+assign defaultaccess
+       switch access=
+              (
+                    if motorroad=yes then false
+                    else if highway=motorway|motorway_link then false
+                    else true
+              )
+              switch or access=private access=no
+                     false
+                     true
+
+#
+# foot access
+#
+assign footaccess
+       switch foot=
+              defaultaccess
+              not or foot=private or foot=no foot=use_sidepath
+
+# A big road is run along on its sidewalk where it has one.
+assign hassidewalk = or sidewalk=both|left|right|yes or sidewalk:both=yes or sidewalk:left=yes sidewalk:right=yes
+
+# Scrambles and climbing routes are no running.
+assign isscramble = sac_scale=demanding_mountain_hiking|alpine_hiking|demanding_alpine_hiking|difficult_alpine_hiking
+
+assign costfactor
+  add switch footaccess 0 100000
+
+  switch and highway= not route=ferry  100000
+
+  switch    route=ferry                              5.67
+  switch or highway=motorway highway=motorway_link   100000
+  switch or highway=proposed highway=abandoned       100000
+  switch    isscramble                               20
+
+  switch    highway=path|footway|pedestrian|track|bridleway  1
+  switch    highway=living_street|residential|service|cycleway  1.15
+  switch    highway=steps                             3
+  switch    highway=unclassified|road                 1.3
+  switch    highway=tertiary|tertiary_link            switch hassidewalk 1.3 1.8
+  switch    highway=secondary|secondary_link          switch hassidewalk 1.5 2.5
+  switch    highway=primary|primary_link              switch hassidewalk 1.8 4
+  switch    highway=trunk|trunk_link                  switch hassidewalk 3 10
+  1.5
+
+# way priorities used for voice hint generation (as BRouter's own)
+
+assign isresidentialorliving = or highway=residential|living_street living_street=yes
+
+assign priorityclassifier =
+
+  if      ( highway=motorway                       ) then  30
+  else if ( highway=motorway_link                  ) then  29
+  else if ( highway=trunk                          ) then  28
+  else if ( highway=trunk_link                     ) then  27
+  else if ( highway=primary                        ) then  26
+  else if ( highway=primary_link                   ) then  25
+  else if ( highway=secondary                      ) then  24
+  else if ( highway=secondary_link                 ) then  23
+  else if ( highway=tertiary                       ) then  22
+  else if ( highway=tertiary_link                  ) then  21
+  else if ( highway=unclassified                   ) then  20
+  else if ( isresidentialorliving                  ) then  6
+  else if ( highway=service                        ) then  6
+  else if ( highway=cycleway                       ) then  6
+  else if ( highway=track                          ) then if tracktype=grade1 then 6 else 4
+  else if ( highway=bridleway|road|path|footway    ) then  4
+  else if ( highway=steps                          ) then  2
+  else if ( highway=pedestrian                     ) then  2
+  else 0
+
+assign isroundabout = junction=roundabout
+assign islinktype = highway=motorway_link|trunk_link|primary_link|secondary_link|tertiary_link
+assign isgoodforcars = if greater priorityclassifier 6 then true
+                  else if ( or isresidentialorliving highway=service ) then true
+                  else if ( and highway=track tracktype=grade1 ) then true
+                  else false
+
+assign classifiermask add multiply isroundabout   4
+                      add multiply islinktype     8
+                          multiply isgoodforcars 16
+
+# The surface and smoothness in the answer's way tags, for the planner's
+# stretches.
+assign dummyUsage = or surface= smoothness=
+
+---context:node  # following code refers to node tags
+
+assign defaultaccess
+       switch access=
+              1
+              switch or access=private access=no
+                     0
+                     1
+
+assign footaccess
+       switch foot=
+              defaultaccess
+              switch or foot=private foot=no
+                     0
+                     1
+
+assign initialcost switch footaccess 0 1000000